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- /* $Id: osmesa.c,v 1.1.1.1 1999/08/19 00:55:42 jtg Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.1
- *
- * Copyright (C) 1999 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
- /*
- * Off-Screen Mesa rendering / Rendering into client memory space
- */
-
-
- #ifdef PC_HEADER
- #include "all.h"
- #else
- #include <stdlib.h>
- #include <string.h>
- #include "GL/osmesa.h"
- #include "context.h"
- #include "depth.h"
- #include "macros.h"
- #include "matrix.h"
- #include "types.h"
- #include "vb.h"
- #endif
-
-
- struct osmesa_context {
- GLcontext *gl_ctx; /* The core GL/Mesa context */
- GLvisual *gl_visual; /* Describes the buffers */
- GLframebuffer *gl_buffer; /* Depth, stencil, accum, etc buffers */
- GLenum format; /* either GL_RGBA or GL_COLOR_INDEX */
- void *buffer; /* the image buffer */
- GLint width, height; /* size of image buffer */
- GLuint pixel; /* current color index or RGBA pixel value */
- GLuint clearpixel; /* pixel for clearing the color buffer */
- GLint rowlength; /* number of pixels per row */
- GLint userRowLength; /* user-specified number of pixels per row */
- GLint rshift, gshift; /* bit shifts for RGBA formats */
- GLint bshift, ashift;
- GLint rind, gind, bind; /* index offsets for RGBA formats */
- void *rowaddr[MAX_HEIGHT]; /* address of first pixel in each image row */
- GLboolean yup; /* TRUE -> Y increases upward */
- /* FALSE -> Y increases downward */
- };
-
-
-
- #ifdef THREADS
-
- #include "mthreads.h" /* Mesa platform independent threads interface */
-
- static MesaTSD osmesa_ctx_tsd;
-
- static void osmesa_ctx_thread_init() {
- MesaInitTSD(&osmesa_ctx_tsd);
- }
-
- static OSMesaContext osmesa_get_thread_context( void ) {
- return (OSMesaContext) MesaGetTSD(&osmesa_ctx_tsd);
- }
-
- static void osmesa_set_thread_context( OSMesaContext ctx ) {
- MesaSetTSD(&osmesa_ctx_tsd, ctx, osmesa_ctx_thread_init);
- }
-
-
- #else
- /* One current context for address space, all threads */
- static OSMesaContext Current = NULL;
- #endif
-
-
-
- /* A forward declaration: */
- static void osmesa_update_state( GLcontext *ctx );
-
-
-
- /**********************************************************************/
- /***** Public Functions *****/
- /**********************************************************************/
-
-
- /*
- * Create an Off-Screen Mesa rendering context. The only attribute needed is
- * an RGBA vs Color-Index mode flag.
- *
- * Input: format - either GL_RGBA or GL_COLOR_INDEX
- * sharelist - specifies another OSMesaContext with which to share
- * display lists. NULL indicates no sharing.
- * Return: an OSMesaContext or 0 if error
- */
- OSMesaContext GLAPIENTRY OSMesaCreateContext( GLenum format, OSMesaContext sharelist )
- {
- OSMesaContext osmesa;
- GLint rshift, gshift, bshift, ashift;
- GLint rind, gind, bind;
- GLint indexBits, alphaBits;
- GLboolean rgbmode;
- GLboolean swalpha;
- GLuint i4 = 1;
- GLubyte *i1 = (GLubyte *) &i4;
- GLint little_endian = *i1;
-
- swalpha = GL_FALSE;
- rind = gind = bind = 0;
- if (format==OSMESA_COLOR_INDEX) {
- indexBits = 8;
- rshift = gshift = bshift = ashift = 0;
- rgbmode = GL_FALSE;
- }
- else if (format==OSMESA_RGBA) {
- indexBits = 0;
- alphaBits = 8;
- if (little_endian) {
- rshift = 0;
- gshift = 8;
- bshift = 16;
- ashift = 24;
- }
- else {
- rshift = 24;
- gshift = 16;
- bshift = 8;
- ashift = 0;
- }
- rgbmode = GL_TRUE;
- }
- else if (format==OSMESA_BGRA) {
- indexBits = 0;
- alphaBits = 8;
- if (little_endian) {
- ashift = 0;
- rshift = 8;
- gshift = 16;
- bshift = 24;
- }
- else {
- bshift = 24;
- gshift = 16;
- rshift = 8;
- ashift = 0;
- }
- rgbmode = GL_TRUE;
- }
- else if (format==OSMESA_ARGB) {
- indexBits = 0;
- alphaBits = 8;
- if (little_endian) {
- bshift = 0;
- gshift = 8;
- rshift = 16;
- ashift = 24;
- }
- else {
- ashift = 24;
- rshift = 16;
- gshift = 8;
- bshift = 0;
- }
- rgbmode = GL_TRUE;
- }
- else if (format==OSMESA_RGB) {
- indexBits = 0;
- alphaBits = 0;
- bshift = 0;
- gshift = 8;
- rshift = 16;
- ashift = 24;
- bind = 2;
- gind = 1;
- rind = 0;
- rgbmode = GL_TRUE;
- swalpha = GL_TRUE;
- }
- else if (format==OSMESA_BGR) {
- indexBits = 0;
- alphaBits = 0;
- bshift = 0;
- gshift = 8;
- rshift = 16;
- ashift = 24;
- bind = 0;
- gind = 1;
- rind = 2;
- rgbmode = GL_TRUE;
- swalpha = GL_TRUE;
- }
- else {
- return NULL;
- }
-
-
- osmesa = (OSMesaContext) calloc( 1, sizeof(struct osmesa_context) );
- if (osmesa) {
- osmesa->gl_visual = gl_create_visual( rgbmode,
- swalpha, /* software alpha */
- GL_FALSE, /* double buffer */
- GL_FALSE, /* stereo */
- DEPTH_BITS,
- STENCIL_BITS,
- ACCUM_BITS,
- indexBits,
- 8, 8, 8, alphaBits );
- if (!osmesa->gl_visual) {
- return NULL;
- }
-
- osmesa->gl_ctx = gl_create_context( osmesa->gl_visual,
- sharelist ? sharelist->gl_ctx : (GLcontext *) NULL,
- (void *) osmesa, GL_TRUE );
- if (!osmesa->gl_ctx) {
- gl_destroy_visual( osmesa->gl_visual );
- free(osmesa);
- return NULL;
- }
- osmesa->gl_buffer = gl_create_framebuffer( osmesa->gl_visual );
- if (!osmesa->gl_buffer) {
- gl_destroy_visual( osmesa->gl_visual );
- gl_destroy_context( osmesa->gl_ctx );
- free(osmesa);
- return NULL;
- }
- osmesa->format = format;
- osmesa->buffer = NULL;
- osmesa->width = 0;
- osmesa->height = 0;
- osmesa->pixel = 0;
- osmesa->clearpixel = 0;
- osmesa->userRowLength = 0;
- osmesa->rowlength = 0;
- osmesa->yup = GL_TRUE;
- osmesa->rshift = rshift;
- osmesa->gshift = gshift;
- osmesa->bshift = bshift;
- osmesa->ashift = ashift;
- osmesa->rind = rind;
- osmesa->gind = gind;
- osmesa->bind = bind;
- }
- return osmesa;
- }
-
-
-
- /*
- * Destroy an Off-Screen Mesa rendering context.
- *
- * Input: ctx - the context to destroy
- */
- void GLAPIENTRY OSMesaDestroyContext( OSMesaContext ctx )
- {
- if (ctx) {
- gl_destroy_visual( ctx->gl_visual );
- gl_destroy_framebuffer( ctx->gl_buffer );
- gl_destroy_context( ctx->gl_ctx );
- free( ctx );
- }
- }
-
-
-
- /*
- * Recompute the values of the context's rowaddr array.
- */
- static void compute_row_addresses( OSMesaContext ctx )
- {
- GLint i;
-
- if (ctx->yup) {
- /* Y=0 is bottom line of window */
- if (ctx->format==OSMESA_COLOR_INDEX) {
- /* 1-byte CI mode */
- GLubyte *origin = (GLubyte *) ctx->buffer;
- for (i=0;i<MAX_HEIGHT;i++) {
- ctx->rowaddr[i] = origin + i * ctx->rowlength;
- }
- }
- else {
- if ((ctx->format==OSMESA_RGB) || (ctx->format==OSMESA_BGR)) {
- /* 3-byte RGB mode */
- GLubyte *origin = (GLubyte *) ctx->buffer;
- for (i=0;i<MAX_HEIGHT;i++) {
- ctx->rowaddr[i] = origin + (i * (ctx->rowlength*3));
- }
- } else {
- /* 4-byte RGBA mode */
- GLuint *origin = (GLuint *) ctx->buffer;
- for (i=0;i<MAX_HEIGHT;i++) {
- ctx->rowaddr[i] = origin + i * ctx->rowlength;
- }
- }
- }
- }
- else {
- /* Y=0 is top line of window */
- if (ctx->format==OSMESA_COLOR_INDEX) {
- /* 1-byte CI mode */
- GLubyte *origin = (GLubyte *) ctx->buffer;
- for (i=0;i<MAX_HEIGHT;i++) {
- ctx->rowaddr[i] = origin + (ctx->height-i-1) * ctx->rowlength;
- }
- }
- else {
- if ((ctx->format==OSMESA_RGB) || (ctx->format==OSMESA_BGR)) {
- /* 3-byte RGB mode */
- GLubyte *origin = (GLubyte *) ctx->buffer;
- for (i=0;i<MAX_HEIGHT;i++) {
- ctx->rowaddr[i] = origin + ((ctx->height-i-1) * (ctx->rowlength*3));
- }
- } else {
- /* 4-byte RGBA mode */
- GLuint *origin = (GLuint *) ctx->buffer;
- for (i=0;i<MAX_HEIGHT;i++) {
- ctx->rowaddr[i] = origin + (ctx->height-i-1) * ctx->rowlength;
- }
- }
- }
- }
- }
-
-
- /*
- * Bind an OSMesaContext to an image buffer. The image buffer is just a
- * block of memory which the client provides. Its size must be at least
- * as large as width*height*sizeof(type). Its address should be a multiple
- * of 4 if using RGBA mode.
- *
- * Image data is stored in the order of glDrawPixels: row-major order
- * with the lower-left image pixel stored in the first array position
- * (ie. bottom-to-top).
- *
- * Since the only type initially supported is GL_UNSIGNED_BYTE, if the
- * context is in RGBA mode, each pixel will be stored as a 4-byte RGBA
- * value. If the context is in color indexed mode, each pixel will be
- * stored as a 1-byte value.
- *
- * If the context's viewport hasn't been initialized yet, it will now be
- * initialized to (0,0,width,height).
- *
- * Input: ctx - the rendering context
- * buffer - the image buffer memory
- * type - data type for pixel components, only GL_UNSIGNED_BYTE
- * supported now
- * width, height - size of image buffer in pixels, at least 1
- * Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx,
- * invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1,
- * width>internal limit or height>internal limit.
- */
- GLboolean GLAPIENTRY OSMesaMakeCurrent( OSMesaContext ctx, void *buffer, GLenum type,
- GLsizei width, GLsizei height )
- {
- if (!ctx || !buffer || type!=GL_UNSIGNED_BYTE
- || width<1 || height<1 || width>MAX_WIDTH || height>MAX_HEIGHT) {
- return GL_FALSE;
- }
-
- osmesa_update_state( ctx->gl_ctx );
- gl_make_current( ctx->gl_ctx, ctx->gl_buffer );
-
- ctx->buffer = buffer;
- ctx->width = width;
- ctx->height = height;
- if (ctx->userRowLength)
- ctx->rowlength = ctx->userRowLength;
- else
- ctx->rowlength = width;
-
- #ifdef THREADS
- /* Set current context for the calling thread */
- osmesa_set_thread_context(ctx);
- #else
- /* Set current context for the address space, all threads */
- Current = ctx;
- #endif
-
- compute_row_addresses( ctx );
-
- /* init viewport */
- if (ctx->gl_ctx->Viewport.Width==0) {
- /* initialize viewport and scissor box to buffer size */
- gl_Viewport( ctx->gl_ctx, 0, 0, width, height );
- ctx->gl_ctx->Scissor.Width = width;
- ctx->gl_ctx->Scissor.Height = height;
- }
-
- return GL_TRUE;
- }
-
-
-
-
- OSMesaContext GLAPIENTRY OSMesaGetCurrentContext( void )
- {
- #ifdef THREADS
- /* Return current handle for the calling thread */
- return osmesa_get_thread_context();
- #else
- /* Return current handle for the address space, all threads */
- return Current;
- #endif
- }
-
-
-
- void GLAPIENTRY OSMesaPixelStore( GLint pname, GLint value )
- {
- OSMesaContext ctx = OSMesaGetCurrentContext();
-
- switch (pname) {
- case OSMESA_ROW_LENGTH:
- if (value<0) {
- gl_error( ctx->gl_ctx, GL_INVALID_VALUE,
- "OSMesaPixelStore(value)" );
- return;
- }
- ctx->userRowLength = value;
- ctx->rowlength = value;
- break;
- case OSMESA_Y_UP:
- ctx->yup = value ? GL_TRUE : GL_FALSE;
- break;
- default:
- gl_error( ctx->gl_ctx, GL_INVALID_ENUM, "OSMesaPixelStore(pname)" );
- return;
- }
-
- compute_row_addresses( ctx );
- }
-
-
- void GLAPIENTRY OSMesaGetIntegerv( GLint pname, GLint *value )
- {
- OSMesaContext ctx = OSMesaGetCurrentContext();
-
- switch (pname) {
- case OSMESA_WIDTH:
- *value = ctx->width;
- return;
- case OSMESA_HEIGHT:
- *value = ctx->height;
- return;
- case OSMESA_FORMAT:
- *value = ctx->format;
- return;
- case OSMESA_TYPE:
- *value = GL_UNSIGNED_BYTE;
- return;
- case OSMESA_ROW_LENGTH:
- *value = ctx->rowlength;
- return;
- case OSMESA_Y_UP:
- *value = ctx->yup;
- return;
- default:
- gl_error( ctx->gl_ctx, GL_INVALID_ENUM, "OSMesaGetIntergerv(pname)" );
- return;
- }
- }
-
-
-
- /*
- * Return the depth buffer associated with an OSMesa context.
- * Input: c - the OSMesa context
- * Output: width, height - size of buffer in pixels
- * bytesPerValue - bytes per depth value (2 or 4)
- * buffer - pointer to depth buffer values
- * Return: GL_TRUE or GL_FALSE to indicate success or failure.
- */
- GLboolean GLAPIENTRY OSMesaGetDepthBuffer( OSMesaContext c, GLint *width, GLint *height,
- GLint *bytesPerValue, void **buffer )
- {
- if ((!c->gl_buffer) || (!c->gl_buffer->Depth)) {
- *width = 0;
- *height = 0;
- *bytesPerValue = 0;
- *buffer = 0;
- return GL_FALSE;
- }
- else {
- *width = c->gl_buffer->Width;
- *height = c->gl_buffer->Height;
- *bytesPerValue = sizeof(GLdepth);
- *buffer = c->gl_buffer->Depth;
- return GL_TRUE;
- }
- }
-
-
-
-
- /**********************************************************************/
- /*** Device Driver Functions ***/
- /**********************************************************************/
-
-
- /*
- * Useful macros:
- */
- #define PACK_RGBA(R,G,B,A) ( ((R) << osmesa->rshift) \
- | ((G) << osmesa->gshift) \
- | ((B) << osmesa->bshift) \
- | ((A) << osmesa->ashift) )
-
- #define PACK_RGBA2(R,G,B,A) ( ((R) << rshift) \
- | ((G) << gshift) \
- | ((B) << bshift) \
- | ((A) << ashift) )
-
- #define UNPACK_RED(P) (((P) >> osmesa->rshift) & 0xff)
- #define UNPACK_GREEN(P) (((P) >> osmesa->gshift) & 0xff)
- #define UNPACK_BLUE(P) (((P) >> osmesa->bshift) & 0xff)
- #define UNPACK_ALPHA(P) (((P) >> osmesa->ashift) & 0xff)
-
- #define PIXELADDR1(X,Y) ((GLubyte *) osmesa->rowaddr[Y] + (X))
- #define PIXELADDR3(X,Y) ((GLubyte *) osmesa->rowaddr[Y] + ((X)*3))
- #define PIXELADDR4(X,Y) ((GLuint *) osmesa->rowaddr[Y] + (X))
-
-
-
-
- static GLboolean set_buffer( GLcontext *ctx, GLenum mode )
- {
- (void) ctx;
- if (mode==GL_FRONT_LEFT) {
- return GL_TRUE;
- }
- else {
- return GL_FALSE;
- }
- }
-
-
- static void clear_index( GLcontext *ctx, GLuint index )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- osmesa->clearpixel = index;
- }
-
-
-
- static void clear_color( GLcontext *ctx,
- GLubyte r, GLubyte g, GLubyte b, GLubyte a )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- osmesa->clearpixel = PACK_RGBA( r, g, b, a );
- }
-
-
-
- static GLbitfield clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
- GLint x, GLint y, GLint width, GLint height )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- if (mask & GL_COLOR_BUFFER_BIT) {
- if (osmesa->format==OSMESA_COLOR_INDEX) {
- if (all) {
- /* Clear whole CI buffer */
- MEMSET(osmesa->buffer, osmesa->clearpixel,
- osmesa->rowlength * osmesa->height);
- }
- else {
- /* Clear part of CI buffer */
- GLint i, j;
- for (i=0;i<height;i++) {
- GLubyte *ptr1 = PIXELADDR1( x, (y+i) );
- for (j=0;j<width;j++) {
- *ptr1++ = osmesa->clearpixel;
- }
- }
- }
- }
- else if ((osmesa->format==OSMESA_RGB)||(osmesa->format==OSMESA_BGR)) {
- GLubyte rval = UNPACK_RED(osmesa->clearpixel);
- GLubyte gval = UNPACK_GREEN(osmesa->clearpixel);
- GLubyte bval = UNPACK_BLUE(osmesa->clearpixel);
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
- if (all) {
- GLuint i, n;
- GLubyte *ptr3 = (GLubyte *) osmesa->buffer;
- /* Clear whole RGB buffer */
- n = osmesa->rowlength * osmesa->height;
- for (i=0;i<n;i++) {
- ptr3[rind] = rval;
- ptr3[gind] = gval;
- ptr3[bind] = bval;
- ptr3 += 3;
- }
- }
- else {
- /* Clear part of RGB buffer */
- GLint i, j;
- for (i=0;i<height;i++) {
- GLubyte *ptr3 = PIXELADDR3( x, (y+i) );
- for (j=0;j<width;j++) {
- ptr3[rind] = rval;
- ptr3[gind] = gval;
- ptr3[bind] = bval;
- ptr3 += 3;
- }
- }
- }
- }
- else {
- if (all) {
- /* Clear whole RGBA buffer */
- GLuint i, n, *ptr4;
- n = osmesa->rowlength * osmesa->height;
- ptr4 = (GLuint *) osmesa->buffer;
- for (i=0;i<n;i++) {
- *ptr4++ = osmesa->clearpixel;
- }
- }
- else {
- /* Clear part of RGBA buffer */
- GLint i, j;
- for (i=0;i<height;i++) {
- GLuint *ptr4 = PIXELADDR4( x, (y+i) );
- for (j=0;j<width;j++) {
- *ptr4++ = osmesa->clearpixel;
- }
- }
- }
- }
- }
- return mask & (~GL_COLOR_BUFFER_BIT);
- }
-
-
-
- static void set_index( GLcontext *ctx, GLuint index )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- osmesa->pixel = index;
- }
-
-
-
- static void set_color( GLcontext *ctx,
- GLubyte r, GLubyte g, GLubyte b, GLubyte a )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- osmesa->pixel = PACK_RGBA( r, g, b, a );
- }
-
-
-
- static void buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- *width = osmesa->width;
- *height = osmesa->height;
- }
-
-
- /**********************************************************************/
- /***** Read/write spans/arrays of RGBA pixels *****/
- /**********************************************************************/
-
- /* Write RGBA pixels to an RGBA (or permuted) buffer. */
- static void write_rgba_span( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- CONST GLubyte rgba[][4], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint *ptr4 = PIXELADDR4( x, y );
- GLuint i;
- GLint rshift = osmesa->rshift;
- GLint gshift = osmesa->gshift;
- GLint bshift = osmesa->bshift;
- GLint ashift = osmesa->ashift;
- if (mask) {
- for (i=0;i<n;i++,ptr4++) {
- if (mask[i]) {
- *ptr4 = PACK_RGBA2( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
- }
- }
- }
- else {
- for (i=0;i<n;i++,ptr4++) {
- *ptr4 = PACK_RGBA2( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
- }
- }
- }
-
-
- /* Write RGBA pixels to an RGBA buffer. This is the fastest span-writer. */
- static void write_rgba_span_rgba( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- CONST GLubyte rgba[][4],
- const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint *ptr4 = PIXELADDR4( x, y );
- const GLuint *rgba4 = (const GLuint *) rgba;
- GLuint i;
- if (mask) {
- for (i=0;i<n;i++) {
- if (mask[i]) {
- ptr4[i] = rgba4[i];
- }
- }
- }
- else {
- MEMCPY( ptr4, rgba4, n * 4 );
- }
- }
-
-
- /* Write RGB pixels to an RGBA (or permuted) buffer. */
- static void write_rgb_span( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- CONST GLubyte rgb[][3], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint *ptr4 = PIXELADDR4( x, y );
- GLuint i;
- GLint rshift = osmesa->rshift;
- GLint gshift = osmesa->gshift;
- GLint bshift = osmesa->bshift;
- GLint ashift = osmesa->ashift;
- if (mask) {
- for (i=0;i<n;i++,ptr4++) {
- if (mask[i]) {
- *ptr4 = PACK_RGBA2( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP], 255 );
- }
- }
- }
- else {
- for (i=0;i<n;i++,ptr4++) {
- *ptr4 = PACK_RGBA2( rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP], 255);
- }
- }
- }
-
-
-
- static void write_monocolor_span( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint *ptr4 = PIXELADDR4(x,y);
- GLuint i;
- for (i=0;i<n;i++,ptr4++) {
- if (mask[i]) {
- *ptr4 = osmesa->pixel;
- }
- }
- }
-
-
-
- static void write_rgba_pixels( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- CONST GLubyte rgba[][4], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- GLint rshift = osmesa->rshift;
- GLint gshift = osmesa->gshift;
- GLint bshift = osmesa->bshift;
- GLint ashift = osmesa->ashift;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLuint *ptr4 = PIXELADDR4(x[i],y[i]);
- *ptr4 = PACK_RGBA2( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP], rgba[i][ACOMP] );
- }
- }
- }
-
-
-
- static void write_monocolor_pixels( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLuint *ptr4 = PIXELADDR4(x[i],y[i]);
- *ptr4 = osmesa->pixel;
- }
- }
- }
-
-
- static void read_rgba_span( const GLcontext *ctx, GLuint n, GLint x, GLint y,
- GLubyte rgba[][4] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- GLuint *ptr4 = PIXELADDR4(x,y);
- for (i=0;i<n;i++) {
- GLuint pixel = *ptr4++;
- rgba[i][RCOMP] = UNPACK_RED(pixel);
- rgba[i][GCOMP] = UNPACK_GREEN(pixel);
- rgba[i][BCOMP] = UNPACK_BLUE(pixel);
- rgba[i][ACOMP] = UNPACK_ALPHA(pixel);
- }
- }
-
-
- /* Read RGBA pixels from an RGBA buffer */
- static void read_rgba_span_rgba( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- GLubyte rgba[][4] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint *ptr4 = PIXELADDR4(x,y);
- MEMCPY( rgba, ptr4, n * 4 * sizeof(GLubyte) );
- }
-
-
- static void read_rgba_pixels( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- GLubyte rgba[][4], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLuint *ptr4 = PIXELADDR4(x[i],y[i]);
- GLuint pixel = *ptr4;
- rgba[i][RCOMP] = UNPACK_RED(pixel);
- rgba[i][GCOMP] = UNPACK_GREEN(pixel);
- rgba[i][BCOMP] = UNPACK_BLUE(pixel);
- rgba[i][ACOMP] = UNPACK_ALPHA(pixel);
- }
- }
- }
-
- /**********************************************************************/
- /***** 3 byte RGB pixel support funcs *****/
- /**********************************************************************/
-
- /* Write RGBA pixels to an RGB or BGR buffer. */
- static void write_rgba_span3( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- CONST GLubyte rgba[][4], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLubyte *ptr3 = PIXELADDR3( x, y);
- GLuint i;
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
- if (mask) {
- for (i=0;i<n;i++,ptr3+=3) {
- if (mask[i]) {
- ptr3[rind] = rgba[i][RCOMP];
- ptr3[gind] = rgba[i][GCOMP];
- ptr3[bind] = rgba[i][BCOMP];
- }
- }
- }
- else {
- for (i=0;i<n;i++,ptr3+=3) {
- ptr3[rind] = rgba[i][RCOMP];
- ptr3[gind] = rgba[i][GCOMP];
- ptr3[bind] = rgba[i][BCOMP];
- }
- }
- }
-
- /* Write RGB pixels to an RGB or BGR buffer. */
- static void write_rgb_span3( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- CONST GLubyte rgb[][3], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLubyte *ptr3 = PIXELADDR3( x, y);
- GLuint i;
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
- if (mask) {
- for (i=0;i<n;i++,ptr3+=3) {
- if (mask[i]) {
- ptr3[rind] = rgb[i][RCOMP];
- ptr3[gind] = rgb[i][GCOMP];
- ptr3[bind] = rgb[i][BCOMP];
- }
- }
- }
- else {
- for (i=0;i<n;i++,ptr3+=3) {
- ptr3[rind] = rgb[i][RCOMP];
- ptr3[gind] = rgb[i][GCOMP];
- ptr3[bind] = rgb[i][BCOMP];
- }
- }
- }
-
-
- static void write_monocolor_span3( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
-
- GLubyte rval = UNPACK_RED(osmesa->pixel);
- GLubyte gval = UNPACK_GREEN(osmesa->pixel);
- GLubyte bval = UNPACK_BLUE(osmesa->pixel);
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
-
-
- GLubyte *ptr3 = PIXELADDR3( x, y);
- GLuint i;
- for (i=0;i<n;i++,ptr3+=3) {
- if (mask[i]) {
- ptr3[rind] = rval;
- ptr3[gind] = gval;
- ptr3[bind] = bval;
- }
- }
- }
-
- static void write_rgba_pixels3( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- CONST GLubyte rgba[][4], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLubyte *ptr3 = PIXELADDR3(x[i],y[i]);
- ptr3[rind] = rgba[i][RCOMP];
- ptr3[gind] = rgba[i][GCOMP];
- ptr3[bind] = rgba[i][BCOMP];
- }
- }
- }
-
- static void write_monocolor_pixels3( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
- GLubyte rval = UNPACK_RED(osmesa->pixel);
- GLubyte gval = UNPACK_GREEN(osmesa->pixel);
- GLubyte bval = UNPACK_BLUE(osmesa->pixel);
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLubyte *ptr3 = PIXELADDR3(x[i],y[i]);
- ptr3[rind] = rval;
- ptr3[gind] = gval;
- ptr3[bind] = bval;
- }
- }
- }
-
- static void read_rgba_span3( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- GLubyte rgba[][4] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
- GLubyte *ptr3 = PIXELADDR3( x, y);
- for (i=0;i<n;i++,ptr3+=3) {
- rgba[i][RCOMP] = ptr3[rind];
- rgba[i][GCOMP] = ptr3[gind];
- rgba[i][BCOMP] = ptr3[bind];
- rgba[i][ACOMP] = 0;
- }
- }
-
- static void read_rgba_pixels3( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- GLubyte rgba[][4], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- GLint rind = osmesa->rind;
- GLint gind = osmesa->gind;
- GLint bind = osmesa->bind;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLubyte *ptr3 = PIXELADDR3(x[i],y[i]);
- rgba[i][RCOMP] = ptr3[rind];
- rgba[i][GCOMP] = ptr3[gind];
- rgba[i][BCOMP] = ptr3[bind];
- rgba[i][ACOMP] = 0;
- }
- }
- }
-
-
- /**********************************************************************/
- /***** Read/write spans/arrays of CI pixels *****/
- /**********************************************************************/
-
- /* Write 32-bit color index to buffer */
- static void write_index32_span( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- const GLuint index[], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLubyte *ptr1 = PIXELADDR1(x,y);
- GLuint i;
- if (mask) {
- for (i=0;i<n;i++,ptr1++) {
- if (mask[i]) {
- *ptr1 = (GLubyte) index[i];
- }
- }
- }
- else {
- for (i=0;i<n;i++,ptr1++) {
- *ptr1 = (GLubyte) index[i];
- }
- }
- }
-
-
- /* Write 8-bit color index to buffer */
- static void write_index8_span( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- const GLubyte index[], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLubyte *ptr1 = PIXELADDR1(x,y);
- GLuint i;
- if (mask) {
- for (i=0;i<n;i++,ptr1++) {
- if (mask[i]) {
- *ptr1 = (GLubyte) index[i];
- }
- }
- }
- else {
- MEMCPY( ptr1, index, n );
- }
- }
-
-
- static void write_monoindex_span( const GLcontext *ctx,
- GLuint n, GLint x, GLint y,
- const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLubyte *ptr1 = PIXELADDR1(x,y);
- GLuint i;
- for (i=0;i<n;i++,ptr1++) {
- if (mask[i]) {
- *ptr1 = (GLubyte) osmesa->pixel;
- }
- }
- }
-
-
- static void write_index_pixels( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- const GLuint index[], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLubyte *ptr1 = PIXELADDR1(x[i],y[i]);
- *ptr1 = (GLubyte) index[i];
- }
- }
- }
-
-
- static void write_monoindex_pixels( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLubyte *ptr1 = PIXELADDR1(x[i],y[i]);
- *ptr1 = (GLubyte) osmesa->pixel;
- }
- }
- }
-
-
- static void read_index_span( const GLcontext *ctx,
- GLuint n, GLint x, GLint y, GLuint index[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- GLubyte *ptr1 = PIXELADDR1(x,y);
- for (i=0;i<n;i++,ptr1++) {
- index[i] = (GLuint) *ptr1;
- }
- }
-
-
- static void read_index_pixels( const GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- GLuint index[], const GLubyte mask[] )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLuint i;
- for (i=0;i<n;i++) {
- if (mask[i] ) {
- GLubyte *ptr1 = PIXELADDR1(x[i],y[i]);
- index[i] = (GLuint) *ptr1;
- }
- }
- }
-
-
-
- /**********************************************************************/
- /***** Optimized line rendering *****/
- /**********************************************************************/
-
-
- /*
- * Draw a flat-shaded, RGB line into an osmesa buffer.
- */
- static void flat_rgba_line( GLcontext *ctx,
- GLuint vert0, GLuint vert1, GLuint pvert )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLubyte *color = ctx->VB->ColorPtr->data[pvert];
- unsigned long pixel = PACK_RGBA( color[0], color[1], color[2], color[3] );
-
- #define INTERP_XY 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) { GLuint *ptr4 = PIXELADDR4(X,Y); *ptr4 = pixel; }
-
- #ifdef WIN32
- #include "..\linetemp.h"
- #else
- #include "linetemp.h"
- #endif
- }
-
-
- /*
- * Draw a flat-shaded, Z-less, RGB line into an osmesa buffer.
- */
- static void flat_rgba_z_line( GLcontext *ctx,
- GLuint vert0, GLuint vert1, GLuint pvert )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLubyte *color = ctx->VB->ColorPtr->data[pvert];
- unsigned long pixel = PACK_RGBA( color[0], color[1], color[2], color[3] );
-
- #define INTERP_XY 1
- #define INTERP_Z 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- if (Z < *zPtr) { \
- GLuint *ptr4 = PIXELADDR4(X,Y); \
- *ptr4 = pixel; \
- *zPtr = Z; \
- }
-
- #ifdef WIN32
- #include "..\linetemp.h"
- #else
- #include "linetemp.h"
- #endif
- }
-
-
- /*
- * Draw a flat-shaded, alpha-blended, RGB line into an osmesa buffer.
- */
- static void flat_blend_rgba_line( GLcontext *ctx,
- GLuint vert0, GLuint vert1, GLuint pvert )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- struct vertex_buffer *VB = ctx->VB;
- GLint rshift = osmesa->rshift;
- GLint gshift = osmesa->gshift;
- GLint bshift = osmesa->bshift;
- GLint avalue = VB->ColorPtr->data[pvert][3];
- GLint msavalue = 255 - avalue;
- GLint rvalue = VB->ColorPtr->data[pvert][0]*avalue;
- GLint gvalue = VB->ColorPtr->data[pvert][1]*avalue;
- GLint bvalue = VB->ColorPtr->data[pvert][2]*avalue;
-
- #define INTERP_XY 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- { GLuint *ptr4 = PIXELADDR4(X,Y); \
- GLuint pixel = 0; \
- pixel |=((((((*ptr4) >> rshift) & 0xff)*msavalue+rvalue)>>8) << rshift);\
- pixel |=((((((*ptr4) >> gshift) & 0xff)*msavalue+gvalue)>>8) << gshift);\
- pixel |=((((((*ptr4) >> bshift) & 0xff)*msavalue+bvalue)>>8) << bshift);\
- *ptr4 = pixel; \
- }
-
- #ifdef WIN32
- #include "..\linetemp.h"
- #else
- #include "linetemp.h"
- #endif
- }
-
- /*
- * Draw a flat-shaded, Z-less, alpha-blended, RGB line into an osmesa buffer.
- */
- static void flat_blend_rgba_z_line( GLcontext *ctx,
- GLuint vert0, GLuint vert1, GLuint pvert )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- struct vertex_buffer *VB = ctx->VB;
- GLint rshift = osmesa->rshift;
- GLint gshift = osmesa->gshift;
- GLint bshift = osmesa->bshift;
- GLint avalue = VB->ColorPtr->data[pvert][3];
- GLint msavalue = 256 - avalue;
- GLint rvalue = VB->ColorPtr->data[pvert][0]*avalue;
- GLint gvalue = VB->ColorPtr->data[pvert][1]*avalue;
- GLint bvalue = VB->ColorPtr->data[pvert][2]*avalue;
-
- #define INTERP_XY 1
- #define INTERP_Z 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- if (Z < *zPtr) { \
- { GLuint *ptr4 = PIXELADDR4(X,Y); \
- GLuint pixel = 0; \
- pixel |=((((((*ptr4) >> rshift) & 0xff)*msavalue+rvalue)>>8) << rshift);\
- pixel |=((((((*ptr4) >> gshift) & 0xff)*msavalue+gvalue)>>8) << gshift);\
- pixel |=((((((*ptr4) >> bshift) & 0xff)*msavalue+bvalue)>>8) << bshift);\
- *ptr4 = pixel; \
- } \
- }
-
- #ifdef WIN32
- #include "..\linetemp.h"
- #else
- #include "linetemp.h"
- #endif
- }
-
- /*
- * Draw a flat-shaded, Z-less, alpha-blended, RGB line into an osmesa buffer.
- */
- static void flat_blend_rgba_z_line_write( GLcontext *ctx,
- GLuint vert0, GLuint vert1, GLuint pvert )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- struct vertex_buffer *VB = ctx->VB;
- GLint rshift = osmesa->rshift;
- GLint gshift = osmesa->gshift;
- GLint bshift = osmesa->bshift;
- GLint avalue = VB->ColorPtr->data[pvert][3];
- GLint msavalue = 256 - avalue;
- GLint rvalue = VB->ColorPtr->data[pvert][0]*avalue;
- GLint gvalue = VB->ColorPtr->data[pvert][1]*avalue;
- GLint bvalue = VB->ColorPtr->data[pvert][2]*avalue;
-
- #define INTERP_XY 1
- #define INTERP_Z 1
- #define CLIP_HACK 1
- #define PLOT(X,Y) \
- if (Z < *zPtr) { \
- { GLuint *ptr4 = PIXELADDR4(X,Y); \
- GLuint pixel = 0; \
- pixel |=((((((*ptr4) >> rshift) & 0xff)*msavalue+rvalue)>>8) << rshift);\
- pixel |=((((((*ptr4) >> gshift) & 0xff)*msavalue+gvalue)>>8) << gshift);\
- pixel |=((((((*ptr4) >> bshift) & 0xff)*msavalue+bvalue)>>8) << bshift);\
- *ptr4 = pixel; \
- } \
- *zPtr = Z; \
- }
-
- #ifdef WIN32
- #include "..\linetemp.h"
- #else
- #include "linetemp.h"
- #endif
- }
-
-
- /*
- * Analyze context state to see if we can provide a fast line drawing
- * function, like those in lines.c. Otherwise, return NULL.
- */
- static line_func choose_line_function( GLcontext *ctx )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
-
- if (ctx->Line.SmoothFlag) return NULL;
- if (ctx->Texture.Enabled) return NULL;
- if (ctx->Light.ShadeModel!=GL_FLAT) return NULL;
-
- if (ctx->Line.Width==1.0F
- && ctx->Line.StippleFlag==GL_FALSE) {
-
- if (ctx->RasterMask==DEPTH_BIT
- && ctx->Depth.Func==GL_LESS
- && ctx->Depth.Mask==GL_TRUE) {
- switch(osmesa->format) {
- case OSMESA_RGBA:
- case OSMESA_BGRA:
- case OSMESA_ARGB:
- return flat_rgba_z_line;
- default:
- return NULL;
- }
- }
-
- if (ctx->RasterMask==0) {
- switch(osmesa->format) {
- case OSMESA_RGBA:
- case OSMESA_BGRA:
- case OSMESA_ARGB:
- return flat_rgba_line;
- default:
- return NULL;
- }
- }
-
- if (ctx->RasterMask==(DEPTH_BIT|BLEND_BIT)
- && ctx->Depth.Func==GL_LESS
- && ctx->Depth.Mask==GL_TRUE
- && ctx->Color.BlendSrcRGB==GL_SRC_ALPHA
- && ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA
- && ctx->Color.BlendSrcA==GL_SRC_ALPHA
- && ctx->Color.BlendDstA==GL_ONE_MINUS_SRC_ALPHA
- && ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) {
- switch(osmesa->format) {
- case OSMESA_RGBA:
- case OSMESA_BGRA:
- case OSMESA_ARGB:
- return flat_blend_rgba_z_line_write;
- default:
- return NULL;
- }
- }
-
- if (ctx->RasterMask==(DEPTH_BIT|BLEND_BIT)
- && ctx->Depth.Func==GL_LESS
- && ctx->Depth.Mask==GL_FALSE
- && ctx->Color.BlendSrcRGB==GL_SRC_ALPHA
- && ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA
- && ctx->Color.BlendSrcA==GL_SRC_ALPHA
- && ctx->Color.BlendDstA==GL_ONE_MINUS_SRC_ALPHA
- && ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) {
- switch(osmesa->format) {
- case OSMESA_RGBA:
- case OSMESA_BGRA:
- case OSMESA_ARGB:
- return flat_blend_rgba_z_line;
- default:
- return NULL;
- }
- }
-
- if (ctx->RasterMask==BLEND_BIT
- && ctx->Color.BlendSrcRGB==GL_SRC_ALPHA
- && ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA
- && ctx->Color.BlendSrcA==GL_SRC_ALPHA
- && ctx->Color.BlendDstA==GL_ONE_MINUS_SRC_ALPHA
- && ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) {
- switch(osmesa->format) {
- case OSMESA_RGBA:
- case OSMESA_BGRA:
- case OSMESA_ARGB:
- return flat_blend_rgba_line;
- default:
- return NULL;
- }
- }
-
- }
- return NULL;
- }
-
-
- /**********************************************************************/
- /***** Optimized triangle rendering *****/
- /**********************************************************************/
-
-
- /*
- * Smooth-shaded, z-less triangle, RGBA color.
- */
- static void smooth_rgba_z_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
- GLuint v2, GLuint pv )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- GLint rshift = osmesa->rshift;
- GLint gshift = osmesa->gshift;
- GLint bshift = osmesa->bshift;
- GLint ashift = osmesa->ashift;
- (void) pv;
- #define INTERP_Z 1
- #define INTERP_RGB 1
- #define INTERP_ALPHA 1
- #define INNER_LOOP( LEFT, RIGHT, Y ) \
- { \
- GLint i, len = RIGHT-LEFT; \
- GLuint *img = PIXELADDR4(LEFT,Y); \
- for (i=0;i<len;i++,img++) { \
- GLdepth z = FixedToDepth(ffz); \
- if (z < zRow[i]) { \
- *img = PACK_RGBA2( FixedToInt(ffr), FixedToInt(ffg), \
- FixedToInt(ffb), FixedToInt(ffa) ); \
- zRow[i] = z; \
- } \
- ffr += fdrdx; ffg += fdgdx; ffb += fdbdx; ffa += fdadx;\
- ffz += fdzdx; \
- } \
- }
- #ifdef WIN32
- #include "..\tritemp.h"
- #else
- #include "tritemp.h"
- #endif
- }
-
-
-
-
- /*
- * Flat-shaded, z-less triangle, RGBA color.
- */
- static void flat_rgba_z_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
- GLuint v2, GLuint pv )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
- #define INTERP_Z 1
- #define SETUP_CODE \
- GLubyte r = VB->ColorPtr->data[pv][0]; \
- GLubyte g = VB->ColorPtr->data[pv][1]; \
- GLubyte b = VB->ColorPtr->data[pv][2]; \
- GLubyte a = VB->ColorPtr->data[pv][3]; \
- GLuint pixel = PACK_RGBA(r,g,b,a);
-
- #define INNER_LOOP( LEFT, RIGHT, Y ) \
- { \
- GLint i, len = RIGHT-LEFT; \
- GLuint *img = PIXELADDR4(LEFT,Y); \
- for (i=0;i<len;i++,img++) { \
- GLdepth z = FixedToDepth(ffz); \
- if (z < zRow[i]) { \
- *img = pixel; \
- zRow[i] = z; \
- } \
- ffz += fdzdx; \
- } \
- }
- #ifdef WIN32
- #include "..\tritemp.h"
- #else
- #include "tritemp.h"
- #endif
- }
-
-
-
- /*
- * Return pointer to an accelerated triangle function if possible.
- */
- static triangle_func choose_triangle_function( GLcontext *ctx )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
-
- if ((osmesa->format==OSMESA_RGB)||(osmesa->format==OSMESA_BGR)) return NULL;
-
- if (ctx->Polygon.SmoothFlag) return NULL;
- if (ctx->Polygon.StippleFlag) return NULL;
- if (ctx->Texture.Enabled) return NULL;
-
- if (ctx->RasterMask==DEPTH_BIT
- && ctx->Depth.Func==GL_LESS
- && ctx->Depth.Mask==GL_TRUE
- && osmesa->format!=OSMESA_COLOR_INDEX) {
- if (ctx->Light.ShadeModel==GL_SMOOTH) {
- return smooth_rgba_z_triangle;
- }
- else {
- return flat_rgba_z_triangle;
- }
- }
- return NULL;
- }
-
-
-
- static const GLubyte *get_string( GLcontext *ctx, GLenum name )
- {
- (void) ctx;
- switch (name) {
- case GL_RENDERER:
- return (const GLubyte *) "Mesa OffScreen";
- default:
- return NULL;
- }
- }
-
-
- static void osmesa_update_state( GLcontext *ctx )
- {
- OSMesaContext osmesa = (OSMesaContext) ctx->DriverCtx;
-
- ctx->Driver.GetString = get_string;
- ctx->Driver.UpdateState = osmesa_update_state;
-
- ctx->Driver.SetBuffer = set_buffer;
- ctx->Driver.Color = set_color;
- ctx->Driver.Index = set_index;
- ctx->Driver.ClearIndex = clear_index;
- ctx->Driver.ClearColor = clear_color;
- ctx->Driver.Clear = clear;
-
- ctx->Driver.GetBufferSize = buffer_size;
-
- ctx->Driver.PointsFunc = NULL;
- ctx->Driver.LineFunc = choose_line_function( ctx );
- ctx->Driver.TriangleFunc = choose_triangle_function( ctx );
-
-
- /* RGB(A) span/pixel functions */
- if ((osmesa->format==OSMESA_RGB) || (osmesa->format==OSMESA_BGR)) {
- /* 3 bytes / pixel in frame buffer */
- ctx->Driver.WriteRGBASpan = write_rgba_span3;
- ctx->Driver.WriteRGBSpan = write_rgb_span3;
- ctx->Driver.WriteRGBAPixels = write_rgba_pixels3;
- ctx->Driver.WriteMonoRGBASpan = write_monocolor_span3;
- ctx->Driver.WriteMonoRGBAPixels = write_monocolor_pixels3;
- ctx->Driver.ReadRGBASpan = read_rgba_span3;
- ctx->Driver.ReadRGBAPixels = read_rgba_pixels3;
- }
- else {
- /* 4 bytes / pixel in frame buffer */
- if (osmesa->format==OSMESA_RGBA
- && RCOMP==0 && GCOMP==1 && BCOMP==2 && ACOMP==3)
- ctx->Driver.WriteRGBASpan = write_rgba_span_rgba;
- else
- ctx->Driver.WriteRGBASpan = write_rgba_span;
- ctx->Driver.WriteRGBSpan = write_rgb_span;
- ctx->Driver.WriteRGBAPixels = write_rgba_pixels;
- ctx->Driver.WriteMonoRGBASpan = write_monocolor_span;
- ctx->Driver.WriteMonoRGBAPixels = write_monocolor_pixels;
- if (osmesa->format==OSMESA_RGBA
- && RCOMP==0 && GCOMP==1 && BCOMP==2 && ACOMP==3)
- ctx->Driver.ReadRGBASpan = read_rgba_span_rgba;
- else
- ctx->Driver.ReadRGBASpan = read_rgba_span;
- ctx->Driver.ReadRGBAPixels = read_rgba_pixels;
- }
-
- /* CI span/pixel functions */
- ctx->Driver.WriteCI32Span = write_index32_span;
- ctx->Driver.WriteCI8Span = write_index8_span;
- ctx->Driver.WriteMonoCISpan = write_monoindex_span;
- ctx->Driver.WriteCI32Pixels = write_index_pixels;
- ctx->Driver.WriteMonoCIPixels = write_monoindex_pixels;
- ctx->Driver.ReadCI32Span = read_index_span;
- ctx->Driver.ReadCI32Pixels = read_index_pixels;
- }
-