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s_context.c
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2002-10-29
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/* $Id: s_context.c,v 1.42 2002/10/29 20:28:59 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 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.
*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "glheader.h"
#include "context.h"
#include "mtypes.h"
#include "imports.h"
#include "swrast.h"
#include "s_blend.h"
#include "s_context.h"
#include "s_lines.h"
#include "s_points.h"
#include "s_span.h"
#include "s_triangle.h"
#include "s_texture.h"
/*
* Recompute the value of swrast->_RasterMask, etc. according to
* the current context.
*/
static void
_swrast_update_rasterflags( GLcontext *ctx )
{
GLuint RasterMask = 0;
if (ctx->Color.AlphaEnabled) RasterMask |= ALPHATEST_BIT;
if (ctx->Color.BlendEnabled) RasterMask |= BLEND_BIT;
if (ctx->Depth.Test) RasterMask |= DEPTH_BIT;
if (ctx->Fog.Enabled) RasterMask |= FOG_BIT;
if (ctx->Scissor.Enabled) RasterMask |= CLIP_BIT;
if (ctx->Stencil.Enabled) RasterMask |= STENCIL_BIT;
if (ctx->Visual.rgbMode) {
const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
if (colorMask != 0xffffffff) RasterMask |= MASKING_BIT;
if (ctx->Color.ColorLogicOpEnabled) RasterMask |= LOGIC_OP_BIT;
if (ctx->Texture._EnabledUnits) RasterMask |= TEXTURE_BIT;
}
else {
if (ctx->Color.IndexMask != 0xffffffff) RasterMask |= MASKING_BIT;
if (ctx->Color.IndexLogicOpEnabled) RasterMask |= LOGIC_OP_BIT;
}
if (ctx->DrawBuffer->UseSoftwareAlphaBuffers
&& ctx->Color.ColorMask[ACOMP]
&& ctx->Color.DrawBuffer != GL_NONE)
RasterMask |= ALPHABUF_BIT;
if ( ctx->Viewport.X < 0
|| ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
|| ctx->Viewport.Y < 0
|| ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
RasterMask |= CLIP_BIT;
}
if (ctx->Depth.OcclusionTest)
RasterMask |= OCCLUSION_BIT;
/* If we're not drawing to exactly one color buffer set the
* MULTI_DRAW_BIT flag. Also set it if we're drawing to no
* buffers or the RGBA or CI mask disables all writes.
*/
if (ctx->Color._DrawDestMask != FRONT_LEFT_BIT &&
ctx->Color._DrawDestMask != BACK_LEFT_BIT &&
ctx->Color._DrawDestMask != FRONT_RIGHT_BIT &&
ctx->Color._DrawDestMask != BACK_RIGHT_BIT) {
/* more than one color buffer designated for writing (or zero buffers) */
RasterMask |= MULTI_DRAW_BIT;
}
else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
RasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
}
else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
RasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
}
SWRAST_CONTEXT(ctx)->_RasterMask = RasterMask;
}
static void
_swrast_update_polygon( GLcontext *ctx )
{
GLfloat backface_sign = 1;
if (ctx->Polygon.CullFlag) {
backface_sign = 1;
switch(ctx->Polygon.CullFaceMode) {
case GL_BACK:
if(ctx->Polygon.FrontFace==GL_CCW)
backface_sign = -1;
break;
case GL_FRONT:
if(ctx->Polygon.FrontFace!=GL_CCW)
backface_sign = -1;
break;
default:
case GL_FRONT_AND_BACK:
backface_sign = 0;
break;
}
}
else {
backface_sign = 0;
}
SWRAST_CONTEXT(ctx)->_backface_sign = backface_sign;
}
static void
_swrast_update_hint( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
(ctx->Hint.Fog == GL_NICEST &&
swrast->AllowPixelFog));
}
/*
* Update the swrast->_AnyTextureCombine flag.
*/
static void
_swrast_update_texture_env( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLuint i;
swrast->_AnyTextureCombine = GL_FALSE;
for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
swrast->_AnyTextureCombine = GL_TRUE;
return;
}
}
}
#define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK | \
_NEW_TEXTURE | \
_NEW_HINT | \
_NEW_POLYGON )
/* State referenced by _swrast_choose_triangle, _swrast_choose_line.
*/
#define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED | \
_NEW_RENDERMODE| \
_NEW_POLYGON| \
_NEW_DEPTH| \
_NEW_STENCIL| \
_NEW_COLOR| \
_NEW_TEXTURE| \
_SWRAST_NEW_RASTERMASK| \
_NEW_LIGHT| \
_NEW_FOG | \
_DD_NEW_SEPARATE_SPECULAR)
#define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED | \
_NEW_RENDERMODE| \
_NEW_LINE| \
_NEW_TEXTURE| \
_NEW_LIGHT| \
_NEW_FOG| \
_NEW_DEPTH | \
_DD_NEW_SEPARATE_SPECULAR)
#define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED | \
_NEW_RENDERMODE | \
_NEW_POINT | \
_NEW_TEXTURE | \
_NEW_LIGHT | \
_NEW_FOG | \
_DD_NEW_SEPARATE_SPECULAR)
#define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
#define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
#define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
/* Stub for swrast->Triangle to select a true triangle function
* after a state change.
*/
static void
_swrast_validate_triangle( GLcontext *ctx,
const SWvertex *v0,
const SWvertex *v1,
const SWvertex *v2 )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
_swrast_validate_derived( ctx );
swrast->choose_triangle( ctx );
if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
ctx->Texture._EnabledUnits == 0) {
swrast->SpecTriangle = swrast->Triangle;
swrast->Triangle = _swrast_add_spec_terms_triangle;
}
swrast->Triangle( ctx, v0, v1, v2 );
}
static void
_swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
_swrast_validate_derived( ctx );
swrast->choose_line( ctx );
if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
ctx->Texture._EnabledUnits == 0) {
swrast->SpecLine = swrast->Line;
swrast->Line = _swrast_add_spec_terms_line;
}
swrast->Line( ctx, v0, v1 );
}
static void
_swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
_swrast_validate_derived( ctx );
swrast->choose_point( ctx );
if ((ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) &&
ctx->Texture._EnabledUnits == 0) {
swrast->SpecPoint = swrast->Point;
swrast->Point = _swrast_add_spec_terms_point;
}
swrast->Point( ctx, v0 );
}
static void
_swrast_validate_blend_func( GLcontext *ctx, GLuint n,
const GLubyte mask[],
GLchan src[][4],
CONST GLchan dst[][4] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
_swrast_validate_derived( ctx );
_swrast_choose_blend_func( ctx );
swrast->BlendFunc( ctx, n, mask, src, dst );
}
static void
_swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
const struct gl_texture_object *tObj,
GLuint n, GLfloat texcoords[][4],
const GLfloat lambda[], GLchan rgba[][4] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
_swrast_validate_derived( ctx );
_swrast_choose_texture_sample_func( ctx, texUnit, tObj );
swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, texcoords,
lambda, rgba );
}
static void
_swrast_sleep( GLcontext *ctx, GLuint new_state )
{
}
static void
_swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLuint i;
swrast->NewState |= new_state;
/* After 10 statechanges without any swrast functions being called,
* put the module to sleep.
*/
if (++swrast->StateChanges > 10) {
swrast->InvalidateState = _swrast_sleep;
swrast->NewState = ~0;
new_state = ~0;
}
if (new_state & swrast->invalidate_triangle)
swrast->Triangle = _swrast_validate_triangle;
if (new_state & swrast->invalidate_line)
swrast->Line = _swrast_validate_line;
if (new_state & swrast->invalidate_point)
swrast->Point = _swrast_validate_point;
if (new_state & _SWRAST_NEW_BLEND_FUNC)
swrast->BlendFunc = _swrast_validate_blend_func;
if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
swrast->TextureSample[i] = _swrast_validate_texture_sample;
if (ctx->Visual.rgbMode) {
ASSERT(swrast->Driver.WriteRGBASpan);
ASSERT(swrast->Driver.WriteRGBSpan);
ASSERT(swrast->Driver.WriteMonoRGBASpan);
ASSERT(swrast->Driver.WriteRGBAPixels);
ASSERT(swrast->Driver.WriteMonoRGBAPixels);
ASSERT(swrast->Driver.ReadRGBASpan);
ASSERT(swrast->Driver.ReadRGBAPixels);
}
else {
ASSERT(swrast->Driver.WriteCI32Span);
ASSERT(swrast->Driver.WriteCI8Span);
ASSERT(swrast->Driver.WriteMonoCISpan);
ASSERT(swrast->Driver.WriteCI32Pixels);
ASSERT(swrast->Driver.WriteMonoCIPixels);
ASSERT(swrast->Driver.ReadCI32Span);
ASSERT(swrast->Driver.ReadCI32Pixels);
}
}
void
_swrast_validate_derived( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (swrast->NewState) {
if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
_swrast_update_rasterflags( ctx );
if (swrast->NewState & _NEW_POLYGON)
_swrast_update_polygon( ctx );
if (swrast->NewState & _NEW_HINT)
_swrast_update_hint( ctx );
if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
_swrast_update_texture_env( ctx );
swrast->NewState = 0;
swrast->StateChanges = 0;
swrast->InvalidateState = _swrast_invalidate_state;
}
}
#define SWRAST_DEBUG 0
/* Public entrypoints: See also s_accum.c, s_bitmap.c, etc.
*/
void
_swrast_Quad( GLcontext *ctx,
const SWvertex *v0, const SWvertex *v1,
const SWvertex *v2, const SWvertex *v3 )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_Quad\n");
_swrast_print_vertex( ctx, v0 );
_swrast_print_vertex( ctx, v1 );
_swrast_print_vertex( ctx, v2 );
_swrast_print_vertex( ctx, v3 );
}
SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
}
void
_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
const SWvertex *v1, const SWvertex *v2 )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_Triangle\n");
_swrast_print_vertex( ctx, v0 );
_swrast_print_vertex( ctx, v1 );
_swrast_print_vertex( ctx, v2 );
}
SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
}
void
_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_Line\n");
_swrast_print_vertex( ctx, v0 );
_swrast_print_vertex( ctx, v1 );
}
SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
}
void
_swrast_Point( GLcontext *ctx, const SWvertex *v0 )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_Point\n");
_swrast_print_vertex( ctx, v0 );
}
SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
}
void
_swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_InvalidateState\n");
}
SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
}
void
_swrast_ResetLineStipple( GLcontext *ctx )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_ResetLineStipple\n");
}
SWRAST_CONTEXT(ctx)->StippleCounter = 0;
}
void
_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
}
SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
}
void
_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
{
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
}
SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
}
GLboolean
_swrast_CreateContext( GLcontext *ctx )
{
GLuint i;
SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_CreateContext\n");
}
if (!swrast)
return GL_FALSE;
swrast->NewState = ~0;
swrast->choose_point = _swrast_choose_point;
swrast->choose_line = _swrast_choose_line;
swrast->choose_triangle = _swrast_choose_triangle;
swrast->invalidate_point = _SWRAST_NEW_POINT;
swrast->invalidate_line = _SWRAST_NEW_LINE;
swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
swrast->Point = _swrast_validate_point;
swrast->Line = _swrast_validate_line;
swrast->Triangle = _swrast_validate_triangle;
swrast->InvalidateState = _swrast_sleep;
swrast->BlendFunc = _swrast_validate_blend_func;
swrast->AllowVertexFog = GL_TRUE;
swrast->AllowPixelFog = GL_TRUE;
if (ctx->Visual.doubleBufferMode)
swrast->CurrentBuffer = BACK_LEFT_BIT;
else
swrast->CurrentBuffer = FRONT_LEFT_BIT;
/* Optimized Accum buffer */
swrast->_IntegerAccumMode = GL_TRUE;
swrast->_IntegerAccumScaler = 0.0;
for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
swrast->TextureSample[i] = _swrast_validate_texture_sample;
swrast->SpanArrays = MALLOC_STRUCT(span_arrays);
if (!swrast->SpanArrays) {
FREE(swrast);
return GL_FALSE;
}
/* init point span buffer */
swrast->PointSpan.primitive = GL_POINT;
swrast->PointSpan.start = 0;
swrast->PointSpan.end = 0;
swrast->PointSpan.facing = 0;
swrast->PointSpan.array = swrast->SpanArrays;
assert(ctx->Const.MaxTextureUnits > 0);
assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_UNITS);
swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits *
MAX_WIDTH * 4 * sizeof(GLchan));
if (!swrast->TexelBuffer) {
FREE(swrast->SpanArrays);
FREE(swrast);
return GL_FALSE;
}
ctx->swrast_context = swrast;
return GL_TRUE;
}
void
_swrast_DestroyContext( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (SWRAST_DEBUG) {
_mesa_debug(ctx, "_swrast_DestroyContext\n");
}
FREE( swrast->SpanArrays );
FREE( swrast->TexelBuffer );
FREE( swrast );
ctx->swrast_context = 0;
}
struct swrast_device_driver *
_swrast_GetDeviceDriverReference( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
return &swrast->Driver;
}
void
_swrast_flush( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
/* flush any pending fragments from rendering points */
if (swrast->PointSpan.end > 0) {
if (ctx->Visual.rgbMode) {
if (ctx->Texture._EnabledUnits)
_mesa_write_texture_span(ctx, &(swrast->PointSpan));
else
_mesa_write_rgba_span(ctx, &(swrast->PointSpan));
}
else {
_mesa_write_index_span(ctx, &(swrast->PointSpan));
}
swrast->PointSpan.end = 0;
}
}
void
_swrast_render_primitive( GLcontext *ctx, GLenum prim )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
_swrast_flush(ctx);
}
swrast->Primitive = prim;
}
void
_swrast_render_start( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (swrast->Driver.SpanRenderStart)
swrast->Driver.SpanRenderStart( ctx );
swrast->PointSpan.end = 0;
}
void
_swrast_render_finish( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (swrast->Driver.SpanRenderFinish)
swrast->Driver.SpanRenderFinish( ctx );
_swrast_flush(ctx);
}
#define SWRAST_DEBUG_VERTICES 0
void
_swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
{
GLuint i;
if (SWRAST_DEBUG_VERTICES) {
_mesa_debug(ctx, "win %f %f %f %f\n",
v->win[0], v->win[1], v->win[2], v->win[3]);
for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
if (ctx->Texture.Unit[i]._ReallyEnabled)
_mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
v->texcoord[i][0], v->texcoord[i][1],
v->texcoord[i][2], v->texcoord[i][3]);
#if CHAN_TYPE == GL_FLOAT
_mesa_debug(ctx, "color %f %f %f %f\n",
v->color[0], v->color[1], v->color[2], v->color[3]);
_mesa_debug(ctx, "spec %f %f %f %f\n",
v->specular[0], v->specular[1],
v->specular[2], v->specular[3]);
#else
_mesa_debug(ctx, "color %d %d %d %d\n",
v->color[0], v->color[1], v->color[2], v->color[3]);
_mesa_debug(ctx, "spec %d %d %d %d\n",
v->specular[0], v->specular[1],
v->specular[2], v->specular[3]);
#endif
_mesa_debug(ctx, "fog %f\n", v->fog);
_mesa_debug(ctx, "index %d\n", v->index);
_mesa_debug(ctx, "pointsize %f\n", v->pointSize);
_mesa_debug(ctx, "\n");
}
}