git.mutantstargoat.com Git - demo_prior/blob - src/post.c

   1 #include <assert.h>
   2 #include "opengl.h"
   3 #include "texture.h"
   4 #include "post.h"
   5 #include "demo.h"
   6 #include "opt.h"
   7
   8 static unsigned int fbtex_gltexid[2];
   9 static unsigned int fbo[2], rbuf_depth[2];
  10 struct texture fbtex[2];
  11 int fbtex_cur;
  12
  13 int post_init(void)
  14 {
  15         int i;
  16
  17         glGenTextures(2, fbtex_gltexid);
  18         glGenRenderbuffers(2, rbuf_depth);
  19
  20         for(i=0; i<2; i++) {
  21                 fbtex[i].id = fbtex_gltexid[i];
  22                 fbtex[i].width = 0;
  23                 fbtex[i].height = 0;
  24                 fbtex[i].pixels = 0;
  25
  26                 glBindTexture(GL_TEXTURE_2D, fbtex[i].id);
  27                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  28                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  29         }
  30         return 0;
  31 }
  32
  33 void post_cleanup(void)
  34 {
  35         if(fbtex_gltexid[0]) {
  36                 glDeleteTextures(2, fbtex_gltexid);
  37         }
  38         if(rbuf_depth[0]) {
  39                 glDeleteRenderbuffers(2, rbuf_depth);
  40         }
  41         if(fbo[0]) {
  42                 glDeleteFramebuffers(2, fbo);
  43         }
  44 }
  45
  46 void post_reshape(int x, int y)
  47 {
  48         int i, ifmt;
  49
  50         if(x != fbtex[0].width || y != fbtex[0].height) {
  51                 ifmt = opt.srgb ? GL_SRGB_ALPHA : GL_RGBA;
  52
  53                 for(i=0; i<2; i++) {
  54                         glBindTexture(GL_TEXTURE_2D, fbtex[i].id);
  55                         glTexImage2D(GL_TEXTURE_2D, 0, ifmt, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
  56                         fbtex[i].width = x;
  57                         fbtex[i].height = y;
  58
  59                         glBindRenderbuffer(GL_RENDERBUFFER, rbuf_depth[i]);
  60                         glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, x, y);
  61                 }
  62
  63                 if(!fbo[0]) {
  64                         glGenFramebuffers(2, fbo);
  65                         for(i=0; i<2; i++) {
  66                                 glBindFramebuffer(GL_FRAMEBUFFER, fbo[i]);
  67                                 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fbtex_gltexid[i], 0);
  68                                 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth[i]);
  69                         }
  70                         glBindFramebuffer(GL_FRAMEBUFFER, 0);
  71                 }
  72         }
  73 }
  74
  75 void overlay(unsigned int tex, float aspect, float alpha)
  76 {
  77         float xscale = aspect / win_aspect;
  78
  79         glMatrixMode(GL_MODELVIEW);
  80         glPushMatrix();
  81         glLoadIdentity();
  82         glMatrixMode(GL_PROJECTION);
  83         glPushMatrix();
  84         glLoadIdentity();
  85         glScalef(xscale, 1.0, 1.0);
  86
  87         glPushAttrib(GL_ENABLE_BIT);
  88         glDisable(GL_DEPTH_TEST);
  89         glDisable(GL_LIGHTING);
  90         glEnable(GL_BLEND);
  91         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  92         glEnable(GL_TEXTURE_2D);
  93
  94         glBindTexture(GL_TEXTURE_2D, tex);
  95
  96         glBegin(GL_QUADS);
  97         glColor4f(1, 1, 1, alpha);
  98         glTexCoord2f(0, 1);
  99         glVertex2f(-1, -1);
 100         glTexCoord2f(1, 1);
 101         glVertex2f(1, -1);
 102         glTexCoord2f(1, 0);
 103         glVertex2f(1, 1);
 104         glTexCoord2f(0, 0);
 105         glVertex2f(-1, 1);
 106         glEnd();
 107
 108         glPopAttrib();
 109
 110         glPopMatrix();
 111         glMatrixMode(GL_MODELVIEW);
 112         glPopMatrix();
 113 }
 114
 115 void overlay_tex(struct texture *tex, float alpha)
 116 {
 117         overlay(tex->id, (float)tex->width / tex->height, alpha);
 118 }