ref: b99349490192aa284dbf1cde3d5f86154e3c9c9d
dir: /src/vertex.c/
#include "zgl.h"
#include <string.h>
void glopNormal(GLContext* c, GLParam* p) {
V3 v;
v.X = p[1].f;
v.Y = p[2].f;
v.Z = p[3].f;
c->current_normal.X = v.X;
c->current_normal.Y = v.Y;
c->current_normal.Z = v.Z;
c->current_normal.W = 0;
}
void glopTexCoord(GLContext* c, GLParam* p) {
c->current_tex_coord.X = p[1].f;
c->current_tex_coord.Y = p[2].f;
c->current_tex_coord.Z = p[3].f;
c->current_tex_coord.W = p[4].f;
}
void glopEdgeFlag(GLContext* c, GLParam* p) { c->current_edge_flag = p[1].i; }
void glopColor(GLContext* c, GLParam* p) {
c->current_color.X = p[1].f;
c->current_color.Y = p[2].f;
c->current_color.Z = p[3].f;
c->current_color.W = p[4].f;
if (c->color_material_enabled) {
GLParam q[7];
q[0].op = OP_Material;
q[1].i = c->current_color_material_mode;
q[2].i = c->current_color_material_type;
q[3].f = p[1].f;
q[4].f = p[2].f;
q[5].f = p[3].f;
q[6].f = p[4].f;
glopMaterial(c, q);
}
}
void gl_eval_viewport(GLContext* c) {
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);
}
void glopBegin(GLContext* c, GLParam* p) {
GLint type;
M4 tmp;
#if TGL_FEATURE_ERROR_CHECK == 1
if(c->in_begin != 0)
#define ERROR_FLAG GL_INVALID_OPERATION
#include "error_check.h"
#else
//if(c->in_begin != 0)return; //<COST>
#endif
type = p[1].i;
c->begin_type = type;
c->in_begin = 1;
c->vertex_n = 0;
c->vertex_cnt = 0;
if (c->matrix_model_projection_updated) {
if (c->lighting_enabled) {
/* precompute inverse modelview */
gl_M4_Inv(&tmp, c->matrix_stack_ptr[0]);
gl_M4_Transpose(&c->matrix_model_view_inv, &tmp);
} else {
GLfloat* m = &c->matrix_model_projection.m[0][0];
/* precompute projection matrix */
gl_M4_Mul(&c->matrix_model_projection, c->matrix_stack_ptr[1], c->matrix_stack_ptr[0]);
/* test to accelerate computation */
c->matrix_model_projection_no_w_transform = 0;
if (m[12] == 0.0 && m[13] == 0.0 && m[14] == 0.0)
c->matrix_model_projection_no_w_transform = 1;
}
/* test if the texture matrix is not Identity */
c->apply_texture_matrix = !gl_M4_IsId(c->matrix_stack_ptr[2]);
c->matrix_model_projection_updated = 0;
}
/* viewport */
if (c->viewport.updated) {
gl_eval_viewport(c);
c->viewport.updated = 0;
}
/* triangle drawing functions */
if (c->render_mode == GL_SELECT) {
c->draw_triangle_front = gl_draw_triangle_select;
c->draw_triangle_back = gl_draw_triangle_select;
}else if (c->render_mode == GL_FEEDBACK){
c->draw_triangle_front = gl_draw_triangle_feedback;
c->draw_triangle_back = gl_draw_triangle_feedback;
} else {
switch (c->polygon_mode_front) {
case GL_POINT:
c->draw_triangle_front = gl_draw_triangle_point;
break;
case GL_LINE:
c->draw_triangle_front = gl_draw_triangle_line;
break;
//case GL_FILL:
default:
c->draw_triangle_front = gl_draw_triangle_fill;
break;
}
switch (c->polygon_mode_back) {
case GL_POINT:
c->draw_triangle_back = gl_draw_triangle_point;
break;
case GL_LINE:
c->draw_triangle_back = gl_draw_triangle_line;
break;
default:
c->draw_triangle_back = gl_draw_triangle_fill;
break;
}
}
}
/* coords, tranformation , clip code and projection */
/* TODO : handle all cases */
static inline void gl_vertex_transform(GLContext* c, GLVertex* v) {
GLfloat* m;
if (c->lighting_enabled) {
/* eye coordinates needed for lighting */
V4* n;
m = &c->matrix_stack_ptr[0]->m[0][0];
v->ec.X = (v->coord.X * m[0] + v->coord.Y * m[1] + v->coord.Z * m[2] + m[3]);
v->ec.Y = (v->coord.X * m[4] + v->coord.Y * m[5] + v->coord.Z * m[6] + m[7]);
v->ec.Z = (v->coord.X * m[8] + v->coord.Y * m[9] + v->coord.Z * m[10] + m[11]);
v->ec.W = (v->coord.X * m[12] + v->coord.Y * m[13] + v->coord.Z * m[14] + m[15]);
/* projection coordinates */
m = &c->matrix_stack_ptr[1]->m[0][0];
v->pc.X = (v->ec.X * m[0] + v->ec.Y * m[1] + v->ec.Z * m[2] + v->ec.W * m[3]);
v->pc.Y = (v->ec.X * m[4] + v->ec.Y * m[5] + v->ec.Z * m[6] + v->ec.W * m[7]);
v->pc.Z = (v->ec.X * m[8] + v->ec.Y * m[9] + v->ec.Z * m[10] + v->ec.W * m[11]);
v->pc.W = (v->ec.X * m[12] + v->ec.Y * m[13] + v->ec.Z * m[14] + v->ec.W * m[15]);
m = &c->matrix_model_view_inv.m[0][0];
n = &c->current_normal;
v->normal.X = (n->X * m[0] + n->Y * m[1] + n->Z * m[2]);
v->normal.Y = (n->X * m[4] + n->Y * m[5] + n->Z * m[6]);
v->normal.Z = (n->X * m[8] + n->Y * m[9] + n->Z * m[10]);
if (c->normalize_enabled) {
gl_V3_Norm_Fast(&v->normal);
}
} else {
/* no eye coordinates needed, no normal */
/* NOTE: W = 1 is assumed */
m = &c->matrix_model_projection.m[0][0];
v->pc.X = (v->coord.X * m[0] + v->coord.Y * m[1] + v->coord.Z * m[2] + m[3]);
v->pc.Y = (v->coord.X * m[4] + v->coord.Y * m[5] + v->coord.Z * m[6] + m[7]);
v->pc.Z = (v->coord.X * m[8] + v->coord.Y * m[9] + v->coord.Z * m[10] + m[11]);
if (c->matrix_model_projection_no_w_transform) {
v->pc.W = m[15];
} else {
v->pc.W = (v->coord.X * m[12] + v->coord.Y * m[13] + v->coord.Z * m[14] + m[15]);
}
}
v->clip_code = gl_clipcode(v->pc.X, v->pc.Y, v->pc.Z, v->pc.W);
}
void glopVertex(GLContext* c, GLParam* p) {
GLVertex* v;
GLint n, i, cnt;
#if TGL_FEATURE_ERROR_CHECK == 1
if(c->in_begin == 0)
#define ERROR_FLAG GL_INVALID_OPERATION
#include "error_check.h"
#else
//assert(c->in_begin != 0);
#endif
n = c->vertex_n;
cnt = c->vertex_cnt;
cnt++;
c->vertex_cnt = cnt;
/* quick fix to avoid crashes on large polygons */
if (n >= c->vertex_max) {
GLVertex* newarray;
c->vertex_max <<= 1; /* just double size */
newarray = gl_malloc(sizeof(GLVertex) * c->vertex_max);
#if TGL_FEATURE_ERROR_CHECK == 1
if (!newarray)
#define ERROR_FLAG GL_OUT_OF_MEMORY
#include "error_check.h"
#else
assert(0);
#endif
memcpy(newarray, c->vertex, n * sizeof(GLVertex));
gl_free(c->vertex);
c->vertex = newarray;
}
/* new vertex entry */
v = &c->vertex[n];
n++;
v->coord.X = p[1].f;
v->coord.Y = p[2].f;
v->coord.Z = p[3].f;
v->coord.W = p[4].f;
gl_vertex_transform(c, v);
/* color */
if (c->lighting_enabled) {
gl_shade_vertex(c, v);
#include "error_check.h"
//^ Don't proceed on an OUT OF MEMORY error.
} else {
v->color = c->current_color;
}
/* tex coords */
if (c->texture_2d_enabled) {
#if TGL_FEATURE_LIT_TEXTURES == 1
if (!(c->lighting_enabled))
v->color = gl_V4_New(1, 1, 1, 0); // Fix by GEK for unlit textured models.
#endif
if (c->apply_texture_matrix) {
gl_M4_MulV4(&v->tex_coord, c->matrix_stack_ptr[2], &c->current_tex_coord);
} else {
v->tex_coord = c->current_tex_coord;
}
}
/* precompute the mapping to the viewport */
if (v->clip_code == 0)
gl_transform_to_viewport(c, v);
/* edge flag */
v->edge_flag = c->current_edge_flag;
switch (c->begin_type) {
case GL_POINTS:
gl_draw_point(c, &c->vertex[0]);
n = 0;
break;
case GL_LINES:
if (n == 2) {
gl_draw_line(c, &c->vertex[0], &c->vertex[1]);
n = 0;
}
break;
case GL_LINE_STRIP:
case GL_LINE_LOOP:
if (n == 1) {
c->vertex[2] = c->vertex[0];
} else if (n == 2) {
gl_draw_line(c, &c->vertex[0], &c->vertex[1]);
c->vertex[0] = c->vertex[1];
n = 1;
}
break;
case GL_TRIANGLES:
if (n == 3) {
gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
n = 0;
}
break;
case GL_TRIANGLE_STRIP:
if (cnt >= 3) {
if (n == 3)
n = 0;
/* needed to respect triangle orientation */
switch (cnt & 1) {
case 0:
gl_draw_triangle(c, &c->vertex[2], &c->vertex[1], &c->vertex[0]);
break;
default:
case 1:
gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
break;
}
}
break;
case GL_TRIANGLE_FAN:
if (n == 3) {
gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
c->vertex[1] = c->vertex[2];
n = 2;
}
break;
case GL_QUADS:
if (n == 4) {
c->vertex[2].edge_flag = 0;
gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
c->vertex[2].edge_flag = 1;
c->vertex[0].edge_flag = 0;
gl_draw_triangle(c, &c->vertex[0], &c->vertex[2], &c->vertex[3]);
n = 0;
}
break;
case GL_QUAD_STRIP:
if (n == 4) {
gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
gl_draw_triangle(c, &c->vertex[1], &c->vertex[3], &c->vertex[2]);
for (i = 0; i < 2; i++)
c->vertex[i] = c->vertex[i + 2];
n = 2;
}
break;
case GL_POLYGON:
break;
default:
gl_fatal_error("glBegin: type %x not handled\n", c->begin_type);
}
c->vertex_n = n;
}
void glopEnd(GLContext* c, GLParam* param) {
#if TGL_FEATURE_ERROR_CHECK == 1
if(c->in_begin != 1)
#define ERROR_FLAG GL_INVALID_OPERATION
#include "error_check.h"
#else
//assert(c->in_begin == 1);
//Assume it went alright.
#endif
if (c->begin_type == GL_LINE_LOOP) {
if (c->vertex_cnt >= 3) {
gl_draw_line(c, &c->vertex[0], &c->vertex[2]);
}
} else if (c->begin_type == GL_POLYGON) {
GLint i = c->vertex_cnt;
while (i >= 3) {
i--;
gl_draw_triangle(c, &c->vertex[i], &c->vertex[0], &c->vertex[i - 1]);
}
}
c->in_begin = 0;
}