mirror of
https://github.com/libretro/scummvm.git
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114 lines
2.3 KiB
C++
114 lines
2.3 KiB
C++
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#include "graphics/tinygl/zgl.h"
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namespace TinyGL {
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int glRenderMode(int mode) {
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GLContext *c = gl_get_context();
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int result = 0;
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switch (c->render_mode) {
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case TGL_RENDER:
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break;
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case TGL_SELECT:
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if (c->select_overflow) {
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result = -c->select_hits;
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} else {
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result = c->select_hits;
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}
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c->select_overflow = 0;
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c->select_ptr = c->select_buffer;
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c->name_stack_size = 0;
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break;
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default:
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assert(0);
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}
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switch(mode) {
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case TGL_RENDER:
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c->render_mode = TGL_RENDER;
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break;
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case TGL_SELECT:
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c->render_mode = TGL_SELECT;
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assert(c->select_buffer != NULL);
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c->select_ptr = c->select_buffer;
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c->select_hits = 0;
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c->select_overflow = 0;
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c->select_hit = NULL;
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break;
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default:
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assert(0);
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}
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return result;
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}
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void glSelectBuffer(int size, unsigned int *buf) {
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GLContext *c = gl_get_context();
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assert(c->render_mode != TGL_SELECT);
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c->select_buffer = buf;
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c->select_size = size;
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}
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void glopInitNames(GLContext *c, GLParam *) {
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if (c->render_mode == TGL_SELECT) {
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c->name_stack_size = 0;
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c->select_hit = NULL;
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}
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}
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void glopPushName(GLContext *c, GLParam *p) {
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if (c->render_mode == TGL_SELECT) {
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assert(c->name_stack_size < MAX_NAME_STACK_DEPTH);
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c->name_stack[c->name_stack_size++] = p[1].i;
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c->select_hit = NULL;
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}
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}
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void glopPopName(GLContext *c, GLParam *) {
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if (c->render_mode == TGL_SELECT) {
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assert(c->name_stack_size > 0);
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c->name_stack_size--;
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c->select_hit = NULL;
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}
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}
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void glopLoadName(GLContext *c, GLParam *p) {
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if (c->render_mode == TGL_SELECT) {
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assert(c->name_stack_size > 0);
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c->name_stack[c->name_stack_size - 1] = p[1].i;
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c->select_hit=NULL;
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}
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}
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void gl_add_select(GLContext *c, unsigned int zmin, unsigned int zmax) {
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unsigned int *ptr;
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int n;
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if (!c->select_overflow) {
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if (!c->select_hit) {
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n = c->name_stack_size;
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if ((c->select_ptr-c->select_buffer + 3 + n) > c->select_size) {
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c->select_overflow = 1;
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} else {
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ptr = c->select_ptr;
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c->select_hit = ptr;
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*ptr++ = c->name_stack_size;
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*ptr++ = zmin;
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*ptr++ = zmax;
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for (int i = 0; i < n; i++)
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*ptr++ = c->name_stack[i];
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c->select_ptr = ptr;
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c->select_hits++;
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}
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} else {
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if (zmin < c->select_hit[1])
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c->select_hit[1] = zmin;
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if (zmax > c->select_hit[2])
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c->select_hit[2] = zmax;
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}
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}
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}
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} // end of namespace TinyGL
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