sdrblurtest

annotate src/rtarg.cc @ 0:26513fdda566

find changesets by author, revision, files, or words in the commit message
initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 17 Oct 2013 08:19:56 +0300
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nuclear@0 1 #include <GL/glew.h>
nuclear@0 2 #include "rtarg.h"
nuclear@0 3
nuclear@0 4 RenderTarget::RenderTarget()
nuclear@0 5 {
nuclear@0 6 fbo = tex = zbuf = 0;
nuclear@0 7 }
nuclear@0 8
nuclear@0 9 RenderTarget::~RenderTarget()
nuclear@0 10 {
nuclear@0 11 destroy();
nuclear@0 12 }
nuclear@0 13
nuclear@0 14 bool RenderTarget::create(int xsz, int ysz)
nuclear@0 15 {
nuclear@0 16 destroy();
nuclear@0 17
nuclear@0 18 glGenFramebuffers(1, &fbo);
nuclear@0 19 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@0 20
nuclear@0 21 this->xsz = xsz;
nuclear@0 22 this->ysz = ysz;
nuclear@0 23 tex_xsz = next_pow2(xsz);
nuclear@0 24 tex_ysz = next_pow2(ysz);
nuclear@0 25
nuclear@0 26 glGenTextures(1, &tex);
nuclear@0 27 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0 28 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@0 29 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@0 30 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
nuclear@0 31 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
nuclear@0 32 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@0 33
nuclear@0 34 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0);
nuclear@0 35
nuclear@0 36 glGenRenderbuffers(1, &zbuf);
nuclear@0 37 glBindRenderbuffer(GL_RENDERBUFFER, zbuf);
nuclear@0 38 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@0 39
nuclear@0 40 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, zbuf);
nuclear@0 41
nuclear@0 42 glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@0 43 return true;
nuclear@0 44 }
nuclear@0 45
nuclear@0 46 void RenderTarget::destroy()
nuclear@0 47 {
nuclear@0 48 if(fbo) {
nuclear@0 49 glDeleteFramebuffers(1, &fbo);
nuclear@0 50 }
nuclear@0 51 if(tex) {
nuclear@0 52 glDeleteTextures(1, &tex);
nuclear@0 53 }
nuclear@0 54 if(zbuf) {
nuclear@0 55 glDeleteRenderbuffers(1, &zbuf);
nuclear@0 56 }
nuclear@0 57 }
nuclear@0 58
nuclear@0 59 void RenderTarget::reshape(int new_xsz, int new_ysz)
nuclear@0 60 {
nuclear@0 61 if(!fbo) {
nuclear@0 62 create(new_xsz, new_ysz);
nuclear@0 63 return;
nuclear@0 64 }
nuclear@0 65
nuclear@0 66 xsz = new_xsz;
nuclear@0 67 ysz = new_ysz;
nuclear@0 68
nuclear@0 69 int new_txsz = next_pow2(new_xsz);
nuclear@0 70 int new_tysz = next_pow2(new_ysz);
nuclear@0 71
nuclear@0 72 if(tex_xsz >= new_txsz && tex_ysz >= new_tysz) {
nuclear@0 73 return;
nuclear@0 74 }
nuclear@0 75
nuclear@0 76 tex_xsz = new_txsz;
nuclear@0 77 tex_ysz = new_tysz;
nuclear@0 78
nuclear@0 79 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0 80 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@0 81
nuclear@0 82 glBindRenderbuffer(GL_RENDERBUFFER, zbuf);
nuclear@0 83 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@0 84 }
nuclear@0 85
nuclear@0 86 void RenderTarget::display() const
nuclear@0 87 {
nuclear@0 88 glMatrixMode(GL_MODELVIEW);
nuclear@0 89 glPushMatrix();
nuclear@0 90 glLoadIdentity();
nuclear@0 91 glMatrixMode(GL_PROJECTION);
nuclear@0 92 glPushMatrix();
nuclear@0 93 glLoadIdentity();
nuclear@0 94
nuclear@0 95 glPushAttrib(GL_ENABLE_BIT);
nuclear@0 96 glDisable(GL_DEPTH_TEST);
nuclear@0 97 glDisable(GL_LIGHTING);
nuclear@0 98 glEnable(GL_TEXTURE_2D);
nuclear@0 99 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0 100
nuclear@0 101 float max_u = (float)xsz / (float)tex_xsz;
nuclear@0 102 float max_v = (float)ysz / (float)tex_ysz;
nuclear@0 103
nuclear@0 104 glBegin(GL_QUADS);
nuclear@0 105 glColor3f(1, 1, 1);
nuclear@0 106 glTexCoord2f(0, 0);
nuclear@0 107 glVertex2f(-1, -1);
nuclear@0 108 glTexCoord2f(max_u, 0);
nuclear@0 109 glVertex2f(1, -1);
nuclear@0 110 glTexCoord2f(max_u, max_v);
nuclear@0 111 glVertex2f(1, 1);
nuclear@0 112 glTexCoord2f(0, max_v);
nuclear@0 113 glVertex2f(-1, 1);
nuclear@0 114 glEnd();
nuclear@0 115
nuclear@0 116 glPopAttrib();
nuclear@0 117 glPopMatrix();
nuclear@0 118 glMatrixMode(GL_MODELVIEW);
nuclear@0 119 glPopMatrix();
nuclear@0 120 }
nuclear@0 121
nuclear@0 122 void bind_render_target(const RenderTarget *rtarg)
nuclear@0 123 {
nuclear@0 124 glBindFramebuffer(GL_FRAMEBUFFER, rtarg ? rtarg->fbo : 0);
nuclear@0 125 }
nuclear@0 126
nuclear@0 127 int next_pow2(int x)
nuclear@0 128 {
nuclear@0 129 x--;
nuclear@0 130 x = (x >> 1) | x;
nuclear@0 131 x = (x >> 2) | x;
nuclear@0 132 x = (x >> 4) | x;
nuclear@0 133 x = (x >> 8) | x;
nuclear@0 134 x = (x >> 16) | x;
nuclear@0 135 return x + 1;
nuclear@0 136 }