forked from KolibriOS/kolibrios
365 lines
8.8 KiB
C
365 lines
8.8 KiB
C
#include "zgl.h"
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void glopNormal(GLContext * c, GLParam * p)
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{
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V3 v;
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v.X = p[1].f;
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v.Y = p[2].f;
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v.Z = p[3].f;
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c->current_normal.X = v.X;
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c->current_normal.Y = v.Y;
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c->current_normal.Z = v.Z;
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c->current_normal.W = 0;
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}
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void glopTexCoord(GLContext * c, GLParam * p)
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{
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c->current_tex_coord.X = p[1].f;
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c->current_tex_coord.Y = p[2].f;
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c->current_tex_coord.Z = p[3].f;
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c->current_tex_coord.W = p[4].f;
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}
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void glopEdgeFlag(GLContext * c, GLParam * p)
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{
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c->current_edge_flag = p[1].i;
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}
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void glopColor(GLContext * c, GLParam * p)
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{
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c->current_color.X = p[1].f;
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c->current_color.Y = p[2].f;
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c->current_color.Z = p[3].f;
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c->current_color.W = p[4].f;
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c->longcurrent_color[0] = p[5].ui;
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c->longcurrent_color[1] = p[6].ui;
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c->longcurrent_color[2] = p[7].ui;
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if (c->color_material_enabled) {
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GLParam q[7];
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q[0].op = OP_Material;
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q[1].i = c->current_color_material_mode;
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q[2].i = c->current_color_material_type;
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q[3].f = p[1].f;
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q[4].f = p[2].f;
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q[5].f = p[3].f;
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q[6].f = p[4].f;
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glopMaterial(c, q);
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}
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}
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void gl_eval_viewport(GLContext * c)
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{
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GLViewport *v;
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float zsize = (1 << (ZB_Z_BITS + ZB_POINT_Z_FRAC_BITS));
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v = &c->viewport;
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v->trans.X = ((v->xsize - 0.5) / 2.0) + v->xmin;
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v->trans.Y = ((v->ysize - 0.5) / 2.0) + v->ymin;
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v->trans.Z = ((zsize - 0.5) / 2.0) + ((1 << ZB_POINT_Z_FRAC_BITS)) / 2;
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v->scale.X = (v->xsize - 0.5) / 2.0;
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v->scale.Y = -(v->ysize - 0.5) / 2.0;
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v->scale.Z = -((zsize - 0.5) / 2.0);
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}
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void glopBegin(GLContext * c, GLParam * p)
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{
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int type;
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M4 tmp;
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assert(c->in_begin == 0);
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type = p[1].i;
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c->begin_type = type;
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c->in_begin = 1;
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c->vertex_n = 0;
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c->vertex_cnt = 0;
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if (c->matrix_model_projection_updated) {
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if (c->lighting_enabled) {
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/* precompute inverse modelview */
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gl_M4_Inv(&tmp, c->matrix_stack_ptr[0]);
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gl_M4_Transpose(&c->matrix_model_view_inv, &tmp);
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} else {
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float *m = &c->matrix_model_projection.m[0][0];
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/* precompute projection matrix */
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gl_M4_Mul(&c->matrix_model_projection,
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c->matrix_stack_ptr[1],
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c->matrix_stack_ptr[0]);
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/* test to accelerate computation */
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c->matrix_model_projection_no_w_transform = 0;
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if (m[12] == 0.0 && m[13] == 0.0 && m[14] == 0.0)
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c->matrix_model_projection_no_w_transform = 1;
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}
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/* test if the texture matrix is not Identity */
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c->apply_texture_matrix = !gl_M4_IsId(c->matrix_stack_ptr[2]);
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c->matrix_model_projection_updated = 0;
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}
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/* viewport */
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if (c->viewport.updated) {
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gl_eval_viewport(c);
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c->viewport.updated = 0;
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}
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/* triangle drawing functions */
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if (c->render_mode == GL_SELECT) {
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c->draw_triangle_front = gl_draw_triangle_select;
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c->draw_triangle_back = gl_draw_triangle_select;
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} else {
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switch (c->polygon_mode_front) {
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case GL_POINT:
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c->draw_triangle_front = gl_draw_triangle_point;
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break;
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case GL_LINE:
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c->draw_triangle_front = gl_draw_triangle_line;
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break;
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default:
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c->draw_triangle_front = gl_draw_triangle_fill;
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break;
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}
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switch (c->polygon_mode_back) {
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case GL_POINT:
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c->draw_triangle_back = gl_draw_triangle_point;
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break;
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case GL_LINE:
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c->draw_triangle_back = gl_draw_triangle_line;
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break;
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default:
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c->draw_triangle_back = gl_draw_triangle_fill;
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break;
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}
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}
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}
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/* coords, tranformation , clip code and projection */
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/* TODO : handle all cases */
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static inline void gl_vertex_transform(GLContext * c, GLVertex * v)
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{
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float *m;
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V4 *n;
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if (c->lighting_enabled) {
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/* eye coordinates needed for lighting */
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m = &c->matrix_stack_ptr[0]->m[0][0];
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v->ec.X = (v->coord.X * m[0] + v->coord.Y * m[1] +
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v->coord.Z * m[2] + m[3]);
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v->ec.Y = (v->coord.X * m[4] + v->coord.Y * m[5] +
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v->coord.Z * m[6] + m[7]);
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v->ec.Z = (v->coord.X * m[8] + v->coord.Y * m[9] +
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v->coord.Z * m[10] + m[11]);
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v->ec.W = (v->coord.X * m[12] + v->coord.Y * m[13] +
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v->coord.Z * m[14] + m[15]);
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/* projection coordinates */
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m = &c->matrix_stack_ptr[1]->m[0][0];
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v->pc.X = (v->ec.X * m[0] + v->ec.Y * m[1] +
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v->ec.Z * m[2] + v->ec.W * m[3]);
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v->pc.Y = (v->ec.X * m[4] + v->ec.Y * m[5] +
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v->ec.Z * m[6] + v->ec.W * m[7]);
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v->pc.Z = (v->ec.X * m[8] + v->ec.Y * m[9] +
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v->ec.Z * m[10] + v->ec.W * m[11]);
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v->pc.W = (v->ec.X * m[12] + v->ec.Y * m[13] +
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v->ec.Z * m[14] + v->ec.W * m[15]);
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m = &c->matrix_model_view_inv.m[0][0];
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n = &c->current_normal;
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v->normal.X = (n->X * m[0] + n->Y * m[1] + n->Z * m[2]);
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v->normal.Y = (n->X * m[4] + n->Y * m[5] + n->Z * m[6]);
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v->normal.Z = (n->X * m[8] + n->Y * m[9] + n->Z * m[10]);
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if (c->normalize_enabled) {
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gl_V3_Norm(&v->normal);
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}
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} else {
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/* no eye coordinates needed, no normal */
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/* NOTE: W = 1 is assumed */
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m = &c->matrix_model_projection.m[0][0];
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v->pc.X = (v->coord.X * m[0] + v->coord.Y * m[1] +
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v->coord.Z * m[2] + m[3]);
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v->pc.Y = (v->coord.X * m[4] + v->coord.Y * m[5] +
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v->coord.Z * m[6] + m[7]);
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v->pc.Z = (v->coord.X * m[8] + v->coord.Y * m[9] +
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v->coord.Z * m[10] + m[11]);
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if (c->matrix_model_projection_no_w_transform) {
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v->pc.W = m[15];
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} else {
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v->pc.W = (v->coord.X * m[12] + v->coord.Y * m[13] +
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v->coord.Z * m[14] + m[15]);
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}
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}
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v->clip_code = gl_clipcode(v->pc.X, v->pc.Y, v->pc.Z, v->pc.W);
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}
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void glopVertex(GLContext * c, GLParam * p)
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{
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GLVertex *v;
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int n, i, cnt;
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assert(c->in_begin != 0);
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n = c->vertex_n;
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cnt = c->vertex_cnt;
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cnt++;
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c->vertex_cnt = cnt;
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/* quick fix to avoid crashes on large polygons */
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if (n >= c->vertex_max) {
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GLVertex *newarray;
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c->vertex_max <<= 1; /* just double size */
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newarray = gl_malloc(sizeof(GLVertex) * c->vertex_max);
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if (!newarray) {
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gl_fatal_error("unable to allocate GLVertex array.\n");
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}
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memcpy(newarray, c->vertex, n * sizeof(GLVertex));
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gl_free(c->vertex);
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c->vertex = newarray;
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}
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/* new vertex entry */
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v = &c->vertex[n];
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n++;
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v->coord.X = p[1].f;
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v->coord.Y = p[2].f;
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v->coord.Z = p[3].f;
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v->coord.W = p[4].f;
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gl_vertex_transform(c, v);
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/* color */
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if (c->lighting_enabled) {
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gl_shade_vertex(c, v);
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} else {
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v->color = c->current_color;
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}
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/* tex coords */
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if (c->texture_2d_enabled) {
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if (c->apply_texture_matrix) {
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gl_M4_MulV4(&v->tex_coord, c->matrix_stack_ptr[2], &c->current_tex_coord);
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} else {
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v->tex_coord = c->current_tex_coord;
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}
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}
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/* precompute the mapping to the viewport */
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if (v->clip_code == 0)
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gl_transform_to_viewport(c, v);
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/* edge flag */
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v->edge_flag = c->current_edge_flag;
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switch (c->begin_type) {
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case GL_POINTS:
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gl_draw_point(c, &c->vertex[0]);
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n = 0;
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break;
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case GL_LINES:
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if (n == 2) {
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gl_draw_line(c, &c->vertex[0], &c->vertex[1]);
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n = 0;
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}
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break;
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case GL_LINE_STRIP:
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case GL_LINE_LOOP:
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if (n == 1) {
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c->vertex[2] = c->vertex[0];
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} else if (n == 2) {
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gl_draw_line(c, &c->vertex[0], &c->vertex[1]);
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c->vertex[0] = c->vertex[1];
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n = 1;
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}
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break;
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case GL_TRIANGLES:
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if (n == 3) {
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gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
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n = 0;
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}
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break;
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case GL_TRIANGLE_STRIP:
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if (cnt >= 3) {
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if (n == 3)
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n = 0;
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/* needed to respect triangle orientation */
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switch(cnt & 1) {
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case 0:
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gl_draw_triangle(c,&c->vertex[2],&c->vertex[1],&c->vertex[0]);
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break;
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default:
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case 1:
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gl_draw_triangle(c,&c->vertex[0],&c->vertex[1],&c->vertex[2]);
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break;
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}
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}
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break;
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case GL_TRIANGLE_FAN:
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if (n == 3) {
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gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
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c->vertex[1] = c->vertex[2];
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n = 2;
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}
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break;
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case GL_QUADS:
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if (n == 4) {
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c->vertex[2].edge_flag = 0;
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gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
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c->vertex[2].edge_flag = 1;
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c->vertex[0].edge_flag = 0;
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gl_draw_triangle(c, &c->vertex[0], &c->vertex[2], &c->vertex[3]);
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n = 0;
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}
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break;
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case GL_QUAD_STRIP:
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if (n == 4) {
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gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
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gl_draw_triangle(c, &c->vertex[1], &c->vertex[3], &c->vertex[2]);
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for (i = 0; i < 2; i++)
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c->vertex[i] = c->vertex[i + 2];
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n = 2;
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}
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break;
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case GL_POLYGON:
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break;
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default:
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gl_fatal_error("glBegin: type %x not handled\n", c->begin_type);
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}
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c->vertex_n = n;
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}
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void glopEnd(GLContext * c, GLParam * param)
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{
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assert(c->in_begin == 1);
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if (c->begin_type == GL_LINE_LOOP) {
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if (c->vertex_cnt >= 3) {
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gl_draw_line(c, &c->vertex[0], &c->vertex[2]);
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}
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} else if (c->begin_type == GL_POLYGON) {
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int i = c->vertex_cnt;
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while (i >= 3) {
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i--;
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gl_draw_triangle(c, &c->vertex[i], &c->vertex[0], &c->vertex[i - 1]);
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}
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}
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c->in_begin = 0;
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}
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