ref: d9a2bcf79e6a92ec19b4b6a5535961e8df571f54
dir: /src/zgl.h/
#ifndef _tgl_zgl_h_
#define _tgl_zgl_h_
#ifndef NDEBUG
#define NDEBUG
#endif
#include "../include/GL/gl.h"
#include "../include/zbuffer.h"
#include "../include/zfeatures.h"
#include "zmath.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif
enum {
#define ADD_OP(a, b, c) OP_##a,
#include "opinfo.h"
};
#if TGL_FEATURE_GL_POLYGON == 1
#define POLYGON_MAX_VERTEX 16
#else
#define POLYGON_MAX_VERTEX 4
#endif
/* Max # of specular light pow buffers */
#define MAX_SPECULAR_BUFFERS 32
/* # of entries in specular buffer */
#define SPECULAR_BUFFER_SIZE 512
/* specular buffer granularity */
#define MAX_MODELVIEW_STACK_DEPTH 32
#define MAX_PROJECTION_STACK_DEPTH 8
#define MAX_TEXTURE_STACK_DEPTH 8
#define MAX_NAME_STACK_DEPTH 16
#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 MAX_DISPLAY_LISTS 16384
#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;
V3 norm_spot_direction;
V3 norm_position;
GLfloat spot_exponent;
GLfloat spot_cutoff;
GLfloat attenuation[3];
/* precomputed values */
GLfloat cos_spot_cutoff;
/* we use a linked list to know which are the enabled lights */
struct GLLight *next, *prev;
GLubyte enabled;
} 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 {
V3 scale;
V3 trans;
GLint xmin, ymin, xsize, ysize;
} 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 {
V3 normal;
V4 coord;
V4 tex_coord;
V4 color;
/* computed values */
V4 ec; /* eye coordinates */
V4 pc; /* coordinates in the normalized volume */
ZBufferPoint zp; /* GLinteger coordinates for the rasterization */
GLint clip_code; /* clip code */
GLint edge_flag;
} GLVertex;
typedef struct GLImage {
PIXEL pixmap[TGL_FEATURE_TEXTURE_DIM * TGL_FEATURE_TEXTURE_DIM];
GLint xsize, ysize;
} GLImage;
/* textures */
#define TEXTURE_HASH_TABLE_SIZE 256
#define TEXTURE_HASH_TABLE_MASK 255
typedef struct GLTexture {
GLImage images[MAX_TEXTURE_LEVELS];
struct GLTexture *next, *prev;
GLint handle;
} 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)(GLVertex* p0, GLVertex* p1, GLVertex* p2);
/* display context */
typedef struct GLContext {
/* lights */
GLLight lights[MAX_LIGHTS];
/* viewport */
GLViewport viewport;
GLMaterial materials[2];
GLVertex vertex[POLYGON_MAX_VERTEX];
M4 matrix_model_view_inv;
M4 matrix_model_projection;
V4 ambient_light_model;
V4 clear_color;
V4 current_color;
V4 current_normal;
V4 current_tex_coord;
V4 rasterpos;
/*Pointers.*/
/* shared state */
GLSharedState shared_state;
ZBuffer* zb;
GLLight* first_light;
GLTexture* current_texture;
GLParamBuffer* current_op_buffer;
M4* matrix_stack[3];
M4* matrix_stack_ptr[3];
gl_draw_triangle_func draw_triangle_front, draw_triangle_back;
/* resize viewport function */
GLint (*gl_resize_viewport)(GLint* xsize, GLint* ysize);
GLfloat* texcoord_array;
GLfloat* vertex_array;
GLfloat* normal_array;
GLfloat* color_array;
#if TGL_FEATURE_ALT_RENDERMODES == 1
GLfloat* feedback_buffer;
GLuint* select_buffer;
GLuint *select_ptr, *select_hit;
GLfloat* feedback_ptr;
#endif
GLint local_light_model;
GLint lighting_enabled;
GLint light_model_two_side;
/* materials */
GLint color_material_enabled;
GLint current_color_material_mode;
GLint current_color_material_type;
/* textures */
GLint texture_2d_enabled;
/* current list */
GLint current_op_buffer_index;
GLint exec_flag, compile_flag, print_flag;
GLuint listbase;
/* matrix */
GLint matrix_mode;
GLint matrix_stack_depth_max[3];
GLint matrix_model_projection_updated;
GLint matrix_model_projection_no_w_transform;
GLint apply_texture_matrix;
/* 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;
/* selection */
#if TGL_FEATURE_ALT_RENDERMODES == 1
GLint render_mode;
GLint select_size;
GLint select_overflow;
GLint select_hits;
#endif
/* glDrawBuffer, glRenderBuffer */
GLenum drawbuffer;
GLenum readbuffer;
/* feedback */
#if TGL_FEATURE_ALT_RENDERMODES == 1
GLuint feedback_size;
GLint feedback_hits;
GLubyte feedback_overflow;
GLenum feedback_type;
/* names */
GLuint name_stack[MAX_NAME_STACK_DEPTH];
GLint name_stack_size;
#endif
/* clear */
GLfloat clear_depth;
GLint current_edge_flag;
/* glBegin / glEnd */
GLint in_begin;
GLint begin_type;
GLint vertex_n, vertex_cnt;
/* opengl 1.1 arrays */
GLint vertex_array_size;
GLint vertex_array_stride;
GLint normal_array_stride;
GLint color_array_size;
GLint color_array_stride;
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 */
/* 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;
/* raster position */
GLint rasterpos_zz;
GLfloat pzoomx, pzoomy;
GLVertex rastervertex;
/* text */
GLTEXTSIZE textsize;
/* buffers */
GLint boundarraybuffer;
GLint boundvertexbuffer;
GLint boundnormalbuffer;
GLint boundcolorbuffer;
GLint boundtexcoordbuffer;
GLubyte rasterposvalid;
#if TGL_FEATURE_ERROR_CHECK == 1
GLenum error_flag;
#endif
} GLContext;
extern GLContext gl_ctx;
static GLContext* gl_get_context(void) { return &gl_ctx; }
extern void (*op_table_func[])(GLParam*);
extern GLint op_table_size[];
extern void gl_compile_op(GLParam* p);
static void gl_add_op(GLParam* p) {
GLContext* c = gl_get_context();
#if TGL_FEATURE_ERROR_CHECK == 1
#include "error_check.h"
#endif
GLint op;
op = p[0].op;
if (c->exec_flag) {
op_table_func[op](p);
#if TGL_FEATURE_ERROR_CHECK == 1
#include "error_check.h"
#endif
}
if (c->compile_flag) {
gl_compile_op(p);
#if TGL_FEATURE_ERROR_CHECK == 1
#include "error_check.h"
#endif
}
}
/* select.c */
void gl_add_select(GLuint zmin, GLuint zmax);
void gl_add_feedback(GLfloat token, GLVertex* v1, GLVertex* v2, GLVertex* v3, GLfloat passthrough_token_value);
/* clip.c */
#define CLIP_EPSILON (1E-5)
static 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);
}
#define CLIP_XMIN (1 << 0)
#define CLIP_XMAX (1 << 1)
#define CLIP_YMIN (1 << 2)
#define CLIP_YMAX (1 << 3)
#define CLIP_ZMIN (1 << 4)
#define CLIP_ZMAX (1 << 5)
static GLfloat clampf(GLfloat a, GLfloat min, GLfloat max) {
if (a < min)
return min;
else if (a > max)
return max;
else
return a;
}
/* triangle */
/*
* Clipping
*/
/* We clip the segment [a,b] against the 6 planes of the normal volume.
* We compute the point 'c' of GLintersection and the value of the parameter 't'
* of the GLintersection if x=a+t(b-a).
*/
void gl_draw_triangle(GLVertex* p0, GLVertex* p1, GLVertex* p2);
void gl_draw_line(GLVertex* p0, GLVertex* p1);
void gl_draw_point(GLVertex* p0);
void gl_draw_triangle_point(GLVertex* p0, GLVertex* p1, GLVertex* p2);
void gl_draw_triangle_line(GLVertex* p0, GLVertex* p1, GLVertex* p2);
void gl_draw_triangle_fill(GLVertex* p0, GLVertex* p1, GLVertex* p2);
void gl_draw_triangle_select(GLVertex* p0, GLVertex* p1, GLVertex* p2);
void gl_draw_triangle_feedback(GLVertex* p0, GLVertex* p1, GLVertex* p2);
/* matrix.c */
void gl_print_matrix(const GLfloat* m);
/*
void glopLoadIdentity(GLParam *p);
void glopTranslate(GLParam *p);*/
/* light.c */
void gl_enable_disable_light(GLint light, GLint v);
void gl_shade_vertex(GLVertex* v);
void glInitTextures();
void glEndTextures();
GLTexture* alloc_texture(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);
void gl_fatal_error(char* format, ...);
/* specular buffer "api" */
GLSpecBuf* specbuf_get_buffer(const GLint shininess_i, const GLfloat shininess);
/* glopXXX functions */
#define ADD_OP(a, b, c) void glop##a(GLParam*);
#include "opinfo.h"
/* this clip epsilon is needed to avoid some rounding errors after
several clipping stages */
static void gl_eval_viewport() {
GLContext* c = gl_get_context();
GLViewport* v;
GLfloat zsize = (1 << (ZB_Z_BITS + ZB_POINT_Z_FRAC_BITS));
v = &c->viewport;
v->trans.X = ((v->xsize - 0.5) / 2.0) + v->xmin;
v->trans.Y = ((v->ysize - 0.5) / 2.0) + v->ymin;
v->trans.Z = ((zsize - 0.5) / 2.0) + ((1 << ZB_POINT_Z_FRAC_BITS)) / 2;
v->scale.X = (v->xsize - 0.5) / 2.0;
v->scale.Y = -(v->ysize - 0.5) / 2.0;
v->scale.Z = -((zsize - 0.5) / 2.0);
}
#endif /* _tgl_zgl_h_ */