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- #ifndef _tgl_zgl_h_
- #define _tgl_zgl_h_
-
- #include <stdlib.h>
- #include <stdio.h>
- #include <math.h>
- #include <assert.h>
- #include <ad709/tinygl/gl.h>
- #include "zbuffer.h"
- #include "zmath.h"
- #include "zfeatures.h"
-
-
-
- #define DEBUG
- /* #define NDEBUG */
-
- enum {
-
- #define ADD_OP(a,b,c) OP_ ## a ,
- #include "opinfo.h"
-
- };
-
-
- /* initially # of allocated GLVertexes (will grow when necessary) */
- #define POLYGON_MAX_VERTEX 16
-
- /* Max # of specular light pow buffers */
- #define MAX_SPECULAR_BUFFERS 8
- /* # of entries in specular buffer */
- #define SPECULAR_BUFFER_SIZE 1024
- /* specular buffer granularity */
- #define SPECULAR_BUFFER_RESOLUTION 1024
-
-
- #define MAX_MODELVIEW_STACK_DEPTH 32
- #define MAX_PROJECTION_STACK_DEPTH 8
- #define MAX_TEXTURE_STACK_DEPTH 8
- #define MAX_NAME_STACK_DEPTH 64
- #define MAX_TEXTURE_LEVELS 11
- #define MAX_LIGHTS 16
-
- #define VERTEX_HASH_SIZE 1031
-
- #define MAX_DISPLAY_LISTS 1024
- #define OP_BUFFER_MAX_SIZE 512
-
- #define TGL_OFFSET_FILL 0x1
- #define TGL_OFFSET_LINE 0x2
- #define TGL_OFFSET_POINT 0x4
-
- typedef struct GLSpecBuf {
- int shininess_i;
- int last_used;
- float buf[SPECULAR_BUFFER_SIZE+1];
- struct GLSpecBuf *next;
- } GLSpecBuf;
-
- typedef struct GLLight {
- V4 ambient;
- V4 diffuse;
- V4 specular;
- V4 position;
- V3 spot_direction;
- float spot_exponent;
- float spot_cutoff;
- float attenuation[3];
- /* precomputed values */
- float cos_spot_cutoff;
- V3 norm_spot_direction;
- V3 norm_position;
- /* we use a linked list to know which are the enabled lights */
- int enabled;
- struct GLLight *next,*prev;
- } GLLight;
-
- typedef struct GLMaterial {
- V4 emission;
- V4 ambient;
- V4 diffuse;
- V4 specular;
- float shininess;
-
- /* computed values */
- int shininess_i;
- int do_specular;
- } GLMaterial;
-
-
- typedef struct GLViewport {
- int xmin,ymin,xsize,ysize;
- V3 scale;
- V3 trans;
- int updated;
- } GLViewport;
-
- typedef union {
- int op;
- float f;
- int i;
- unsigned int ui;
- void *p;
- } GLParam;
-
- typedef struct GLParamBuffer {
- GLParam ops[OP_BUFFER_MAX_SIZE];
- struct GLParamBuffer *next;
- } GLParamBuffer;
-
- typedef struct GLList {
- GLParamBuffer *first_op_buffer;
- /* TODO: extensions for an hash table or a better allocating scheme */
- } GLList;
-
- typedef struct GLVertex {
- int edge_flag;
- V3 normal;
- V4 coord;
- V4 tex_coord;
- V4 color;
-
- /* computed values */
- V4 ec; /* eye coordinates */
- V4 pc; /* coordinates in the normalized volume */
- int clip_code; /* clip code */
- ZBufferPoint zp; /* integer coordinates for the rasterization */
- } GLVertex;
-
- typedef struct GLImage {
- void *pixmap;
- int xsize,ysize;
- } GLImage;
-
- /* textures */
-
- #define TEXTURE_HASH_TABLE_SIZE 256
-
- typedef struct GLTexture {
- GLImage images[MAX_TEXTURE_LEVELS];
- int handle;
- struct GLTexture *next,*prev;
- } GLTexture;
-
-
- /* shared state */
-
- typedef struct GLSharedState {
- GLList **lists;
- GLTexture **texture_hash_table;
- } GLSharedState;
-
- struct GLContext;
-
- typedef void (*gl_draw_triangle_func)(struct GLContext *c,
- GLVertex *p0,GLVertex *p1,GLVertex *p2);
-
- /* display context */
- typedef struct GLContext {
- /* Z buffer */
- ZBuffer *zb;
-
- /* lights */
- GLLight lights[MAX_LIGHTS];
- GLLight *first_light;
- V4 ambient_light_model;
- int local_light_model;
- int lighting_enabled;
- int light_model_two_side;
-
- /* materials */
- GLMaterial materials[2];
- int color_material_enabled;
- int current_color_material_mode;
- int current_color_material_type;
-
- /* textures */
- GLTexture *current_texture;
- int texture_2d_enabled;
-
- /* shared state */
- GLSharedState shared_state;
-
- /* current list */
- GLParamBuffer *current_op_buffer;
- int current_op_buffer_index;
- int exec_flag,compile_flag,print_flag;
-
- /* matrix */
-
- int matrix_mode;
- M4 *matrix_stack[3];
- M4 *matrix_stack_ptr[3];
- int matrix_stack_depth_max[3];
-
- M4 matrix_model_view_inv;
- M4 matrix_model_projection;
- int matrix_model_projection_updated;
- int matrix_model_projection_no_w_transform;
- int apply_texture_matrix;
-
- /* viewport */
- GLViewport viewport;
-
- /* current state */
- int polygon_mode_back;
- int polygon_mode_front;
-
- int current_front_face;
- int current_shade_model;
- int current_cull_face;
- int cull_face_enabled;
- int normalize_enabled;
- int blending_enabled;
- gl_draw_triangle_func draw_triangle_front, draw_triangle_back;
-
- /* selection */
- int render_mode;
- unsigned int *select_buffer;
- int select_size;
- unsigned int *select_ptr,*select_hit;
- int select_overflow;
- int select_hits;
-
- /* names */
- unsigned int name_stack[MAX_NAME_STACK_DEPTH];
- int name_stack_size;
-
- /* clear */
- float clear_depth;
- V4 clear_color;
-
- /* current vertex state */
- V4 current_color;
- unsigned int longcurrent_color[3]; /* precomputed integer color */
- V4 current_normal;
- V4 current_tex_coord;
- int current_edge_flag;
-
- /* glBegin / glEnd */
- int in_begin;
- int begin_type;
- int vertex_n,vertex_cnt;
- int vertex_max;
- GLVertex *vertex;
-
- /* opengl 1.1 arrays */
- float *vertex_array;
- int vertex_array_size;
- int vertex_array_stride;
- float *normal_array;
- int normal_array_stride;
- float *color_array;
- int color_array_size;
- int color_array_stride;
- float *texcoord_array;
- int texcoord_array_size;
- int texcoord_array_stride;
- int client_states;
-
- /* opengl 1.1 polygon offset */
- float offset_factor;
- float offset_units;
- int offset_states;
-
- /* specular buffer. could probably be shared between contexts,
- but that wouldn't be 100% thread safe */
- GLSpecBuf *specbuf_first;
- int specbuf_used_counter;
- int specbuf_num_buffers;
-
- /* opaque structure for user's use */
- void *opaque;
- /* resize viewport function */
- int (*gl_resize_viewport)(struct GLContext *c,int *xsize,int *ysize);
-
- /* depth test */
- int depth_test;
- } GLContext;
-
- extern GLContext *gl_ctx;
-
- void glDebug(int mode);
- void glInit(void *zbuffer);
- void glClose(void);
-
-
- void gl_add_op(GLParam *p);
-
- /* clip.c */
- void gl_transform_to_viewport(GLContext *c,GLVertex *v);
- void gl_draw_triangle(GLContext *c,GLVertex *p0,GLVertex *p1,GLVertex *p2);
- void gl_draw_line(GLContext *c,GLVertex *p0,GLVertex *p1);
- void gl_draw_point(GLContext *c,GLVertex *p0);
-
- void gl_draw_triangle_point(GLContext *c, GLVertex *p0,GLVertex *p1,GLVertex *p2);
- void gl_draw_triangle_line(GLContext *c, GLVertex *p0,GLVertex *p1,GLVertex *p2);
- void gl_draw_triangle_fill(GLContext *c, GLVertex *p0,GLVertex *p1,GLVertex *p2);
- void gl_draw_triangle_select(GLContext *c, GLVertex *p0,GLVertex *p1,GLVertex *p2);
-
- /* matrix.c */
- void gl_print_matrix(const float *m);
- /*
- void glopLoadIdentity(GLContext *c,GLParam *p);
- void glopTranslate(GLContext *c,GLParam *p);*/
-
- /* light.c */
- void gl_add_select(GLContext *c,unsigned int zmin,unsigned int zmax);
- void gl_enable_disable_light(GLContext *c,int light,int v);
- void gl_shade_vertex(GLContext *c,GLVertex *v);
-
- void glInitTextures(GLContext *c);
- void glEndTextures(GLContext *c);
- GLTexture *alloc_texture(GLContext *c,int h);
-
- /* image_util.c */
- void gl_convertRGB_to_5R6G5B(unsigned short *pixmap,unsigned char *rgb,
- int xsize,int ysize);
- void gl_convertRGB_to_8A8R8G8B(unsigned int *pixmap, unsigned char *rgb,
- int xsize, int ysize);
- void gl_resizeImage(unsigned char *dest,int xsize_dest,int ysize_dest,
- unsigned char *src,int xsize_src,int ysize_src);
- void gl_resizeImageNoInterpolate(unsigned char *dest,int xsize_dest,int ysize_dest,
- unsigned char *src,int xsize_src,int ysize_src);
-
- GLContext *gl_get_context(void);
-
- void gl_fatal_error(char *format, ...);
-
-
- /* specular buffer "api" */
- GLSpecBuf *specbuf_get_buffer(GLContext *c, const int shininess_i,
- const float shininess);
-
- #ifdef DEBUG
- #define dprintf(format, args...) fprintf(stderr,"In '%s': " format "\n",__FUNCTION__, ##args);
- #else
- #define dprintf(format, args...)
- #endif
-
- /* glopXXX functions */
- #define ADD_OP(a,b,c) void glop ## a (GLContext *,GLParam *);
- #include "opinfo.h"
-
- /* this clip epsilon is needed to avoid some rounding errors after
- several clipping stages */
-
- #define CLIP_EPSILON (1E-5)
-
- static inline int gl_clipcode(float x,float y,float z,float w1) {
- float w;
-
- w=w1 * (1.0 + CLIP_EPSILON);
- return (x<-w) | ((x>w)<<1) | ((y<-w)<<2) | ((y>w)<<3) | ((z<-w)<<4) | ((z>w)<<5) ;
- }
-
- #endif /* _tgl_zgl_h_ */
-