ref: 991af3667599e78b0aa9253f6b9ff57ea6f0371e
dir: /src/zgl.h/
#ifndef _tgl_zgl_h_
#define _tgl_zgl_h_
#include "../include/GL/gl.h"
#include "../include/zfeatures.h"
#include "../include/zbuffer.h"
#include "zmath.h"
#include <assert.h>
#include <math.h>
#include <stdlib.h>
//Needed for memcpy
#include <string.h>
#ifndef M_PI
#define M_PI 3.14159265358979323
#endif
//#define DEBUG
#ifndef NDEBUG
#define NDEBUG
#endif
enum {
#define ADD_OP(a, b, c) OP_##a,
#include "opinfo.h"
};
/* initially # of allocated GLVertexes (will grow when necessary) */
/* Just large enough to hold a quad... because most users will never render anything larger. */
#define POLYGON_MAX_VERTEX 4
/* Max # of specular light pow buffers */
#define MAX_SPECULAR_BUFFERS 32
//#define MAX_SPECULAR_BUFFERS 16
/* # of entries in specular buffer */
#define SPECULAR_BUFFER_SIZE 512
/* 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 1
#define MAX_LIGHTS 16
#define VERTEX_ARRAY 0x0001
#define COLOR_ARRAY 0x0002
#define NORMAL_ARRAY 0x0004
#define TEXCOORD_ARRAY 0x0008
//#define VERTEX_HASH_SIZE 1031
#define MAX_DISPLAY_LISTS 1024
#define OP_BUFFER_MAX_SIZE 4096
#define TGL_OFFSET_FILL 0x1
#define TGL_OFFSET_LINE 0x2
#define TGL_OFFSET_POINT 0x4
typedef struct GLSpecBuf {
GLint shininess_i;
GLint last_used;
GLfloat buf[SPECULAR_BUFFER_SIZE + 1];
struct GLSpecBuf* next;
} GLSpecBuf;
typedef struct GLLight {
V4 ambient;
V4 diffuse;
V4 specular;
V4 position;
V3 spot_direction;
GLfloat spot_exponent;
GLfloat spot_cutoff;
GLfloat attenuation[3];
/* precomputed values */
GLfloat cos_spot_cutoff;
V3 norm_spot_direction;
V3 norm_position;
/* we use a linked list to know which are the enabled lights */
GLint enabled;
struct GLLight *next, *prev;
} GLLight;
typedef struct GLMaterial {
V4 emission;
V4 ambient;
V4 diffuse;
V4 specular;
GLfloat shininess;
/* computed values */
GLint shininess_i;
GLint do_specular;
} GLMaterial;
typedef struct GLViewport {
GLint xmin, ymin, xsize, ysize;
V3 scale;
V3 trans;
GLint updated;
} GLViewport;
typedef union {
GLint op;
GLfloat f;
GLint i;
GLuint 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 {
GLint edge_flag;
V3 normal;
V4 coord;
V4 tex_coord;
V4 color;
/* computed values */
V4 ec; /* eye coordinates */
V4 pc; /* coordinates in the normalized volume */
GLint clip_code; /* clip code */
ZBufferPoint zp; /* GLinteger coordinates for the rasterization */
} GLVertex;
typedef struct GLImage {
void* pixmap;
GLint xsize, ysize;
} GLImage;
/* textures */
#define TEXTURE_HASH_TABLE_SIZE 256
typedef struct GLTexture {
GLImage images[MAX_TEXTURE_LEVELS];
GLint handle;
struct GLTexture *next, *prev;
} GLTexture;
/* buffers */
#define MAX_BUFFERS 2048
typedef struct GLBuffer{
void* data;
GLuint size;
} GLBuffer;
/* shared state */
typedef struct GLSharedState {
GLList** lists;
GLTexture** texture_hash_table;
GLBuffer** buffers;
} 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;
#if TGL_FEATURE_ERROR_CHECK == 1
GLenum error_flag;
#endif
/* lights */
GLLight lights[MAX_LIGHTS];
GLLight* first_light;
V4 ambient_light_model;
GLint local_light_model;
GLint lighting_enabled;
GLint light_model_two_side;
/* materials */
GLMaterial materials[2];
GLint color_material_enabled;
GLint current_color_material_mode;
GLint current_color_material_type;
/* textures */
GLTexture* current_texture;
GLint texture_2d_enabled;
/* shared state */
GLSharedState shared_state;
/* current list */
GLParamBuffer* current_op_buffer;
GLint current_op_buffer_index;
GLint exec_flag, compile_flag, print_flag;
GLuint listbase;
/* matrix */
GLint matrix_mode;
M4* matrix_stack[3];
M4* matrix_stack_ptr[3];
GLint matrix_stack_depth_max[3];
M4 matrix_model_view_inv;
M4 matrix_model_projection;
GLint matrix_model_projection_updated;
GLint matrix_model_projection_no_w_transform;
GLint apply_texture_matrix;
/* viewport */
GLViewport viewport;
/* current state */
GLint polygon_mode_back;
GLint polygon_mode_front;
GLint current_front_face;
GLint current_shade_model;
GLint current_cull_face;
GLint cull_face_enabled;
GLint normalize_enabled;
gl_draw_triangle_func draw_triangle_front, draw_triangle_back;
/* selection */
GLint render_mode;
GLuint* select_buffer;
GLint select_size;
GLuint *select_ptr, *select_hit;
GLint select_overflow;
GLint select_hits;
/* glDrawBuffer, glRenderBuffer */
GLenum drawbuffer;
GLenum readbuffer;
/* feedback */
//render_mode as seen above
GLfloat* feedback_buffer;
GLfloat* feedback_ptr;
GLuint feedback_size;
GLint feedback_hits;
GLubyte feedback_overflow;
GLenum feedback_type;
/* names */
GLuint name_stack[MAX_NAME_STACK_DEPTH];
GLint name_stack_size;
/* clear */
GLfloat clear_depth;
V4 clear_color;
/* current vertex state */
V4 current_color;
V4 current_normal;
V4 current_tex_coord;
GLint current_edge_flag;
/* glBegin / glEnd */
GLint in_begin;
GLint begin_type;
GLint vertex_n, vertex_cnt;
GLint vertex_max;
GLVertex* vertex;
/* opengl 1.1 arrays */
GLfloat* vertex_array;
GLint vertex_array_size;
GLint vertex_array_stride;
GLfloat* normal_array;
GLint normal_array_stride;
GLfloat* color_array;
GLint color_array_size;
GLint color_array_stride;
GLfloat* texcoord_array;
GLint texcoord_array_size;
GLint texcoord_array_stride;
GLint client_states;
/* opengl 1.1 polygon offset */
GLfloat offset_factor;
GLfloat offset_units;
GLint offset_states;
/* opengl blending */
// All the settings are in the Zbuffer!
/* specular buffer. could probably be shared between contexts,
but that wouldn't be 100% thread safe */
#if TGL_FEATURE_SPECULAR_BUFFERS == 1
GLSpecBuf* specbuf_first;
GLint specbuf_used_counter;
GLint specbuf_num_buffers;
#endif
GLint zEnableSpecular; // Enable specular lighting
/* opaque structure for user's use */
void* opaque;
/* resize viewport function */
GLint (*gl_resize_viewport)(struct GLContext* c, GLint* xsize, GLint* ysize);
/* depth test */
//Moved to Zbuffer.
/* raster position */
V4 rasterpos;
GLint rasterpos_zz;
GLubyte rasterposvalid;
GLfloat pzoomx, pzoomy;
GLVertex rastervertex;
/* text */
GLTEXTSIZE textsize;
/* buffers */
GLint boundarraybuffer; //0 if no buffer is bound.
GLint boundvertexbuffer;
GLint boundnormalbuffer;
GLint boundcolorbuffer;
GLint boundtexcoordbuffer;
} GLContext;
extern GLContext* gl_ctx;
//void gl_add_op(GLParam* p);
extern void (*op_table_func[])(GLContext*, GLParam*);
extern GLint op_table_size[];
extern void gl_compile_op(GLContext* c, GLParam* p);
static inline void gl_add_op(GLParam* p) {
GLContext* c = gl_ctx;
#include "error_check.h"
GLint op;
op = p[0].op;
if (c->exec_flag) {
op_table_func[op](c, p);
#include "error_check.h"
}
if (c->compile_flag) {
gl_compile_op(c, p);
#include "error_check.h"
}
if (c->print_flag) {
// gl_print_op(stderr, 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);
void gl_draw_triangle_feedback(GLContext* c, GLVertex* p0, GLVertex* p1, GLVertex* p2);
/* matrix.c */
void gl_print_matrix(const GLfloat* m);
/*
void glopLoadIdentity(GLContext *c,GLParam *p);
void glopTranslate(GLContext *c,GLParam *p);*/
/* select.c */
void gl_add_select(GLContext* c, GLuint zmin, GLuint zmax);
void gl_add_feedback(GLContext* c, GLfloat token,
GLVertex* v1,
GLVertex* v2,
GLVertex* v3,
GLfloat passthrough_token_value
);
/* light.c */
void gl_enable_disable_light(GLContext* c, GLint light, GLint v);
void gl_shade_vertex(GLContext* c, GLVertex* v);
void glInitTextures(GLContext* c);
void glEndTextures(GLContext* c);
GLTexture* alloc_texture(GLContext* c, GLint h);
/* image_util.c */
void gl_convertRGB_to_5R6G5B(GLushort* pixmap, GLubyte* rgb, GLint xsize, GLint ysize);
void gl_convertRGB_to_8A8R8G8B(GLuint* pixmap, GLubyte* rgb, GLint xsize, GLint ysize);
void gl_resizeImage(GLubyte* dest, GLint xsize_dest, GLint ysize_dest, GLubyte* src, GLint xsize_src, GLint ysize_src);
void gl_resizeImageNoInterpolate(GLubyte* dest, GLint xsize_dest, GLint ysize_dest, GLubyte* src, GLint xsize_src, GLint ysize_src);
GLContext* gl_get_context(void);
void gl_fatal_error(char* format, ...);
/* specular buffer "api" */
GLSpecBuf* specbuf_get_buffer(GLContext* c, const GLint shininess_i, const GLfloat shininess);
#ifdef __BEOS__
void dprintf(const char*, ...);
#else /* !BEOS */
#ifdef DEBUG
#define dprintf(format, args...) tgl_warning("In '%s': " format "\n", __FUNCTION__, ##args);
#else
#define dprintf(format, args...)
#endif
#endif /* !BEOS */
/* 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 GLint gl_clipcode(GLfloat x, GLfloat y, GLfloat z, GLfloat w1) {
GLfloat 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);
}
static inline GLfloat clampf(GLfloat a, GLfloat min, GLfloat max) {
if (a < min)
return min;
else if (a > max)
return max;
else
return a;
}
#endif /* _tgl_zgl_h_ */