vrseasons

annotate src/rtarg.cc @ 0:393ef1143c9c

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VR seasons
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 07 Apr 2015 11:16:56 +0300
parents
children eea1b91dc3d4
rev   line source
nuclear@0 1 #include "opengl.h"
nuclear@0 2 #include "rtarg.h"
nuclear@0 3
nuclear@0 4 static int next_pow2(int x);
nuclear@0 5
nuclear@0 6 RenderTarget::RenderTarget()
nuclear@0 7 {
nuclear@0 8 xsz = ysz = 0;
nuclear@0 9 fbo = color = depth = 0;
nuclear@0 10
nuclear@0 11 tex_fmt = 0;
nuclear@0 12 tex_xsz = tex_ysz = 0;
nuclear@0 13 }
nuclear@0 14
nuclear@0 15 RenderTarget::~RenderTarget()
nuclear@0 16 {
nuclear@0 17 destroy();
nuclear@0 18 }
nuclear@0 19
nuclear@0 20 bool RenderTarget::create(int xsz, int ysz)
nuclear@0 21 {
nuclear@0 22 destroy();
nuclear@0 23
nuclear@0 24 this->xsz = xsz;
nuclear@0 25 this->ysz = ysz;
nuclear@0 26
nuclear@0 27 tex_xsz = next_pow2(xsz);
nuclear@0 28 tex_ysz = next_pow2(ysz);
nuclear@0 29 tex_fmt = check_extension("GL_ARB_texture_float") ? GL_RGB16F : GL_RGB;
nuclear@0 30
nuclear@0 31 glGenFramebuffers(1, &fbo);
nuclear@0 32 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@0 33
nuclear@0 34 glGenTextures(1, &color);
nuclear@0 35 glBindTexture(GL_TEXTURE_2D, color);
nuclear@0 36 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@0 37 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@0 38 glTexImage2D(GL_TEXTURE_2D, 0, tex_fmt, tex_xsz, tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
nuclear@0 39 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color, 0);
nuclear@0 40
nuclear@0 41 glGenRenderbuffers(1, &depth);
nuclear@0 42 glBindRenderbuffer(GL_RENDERBUFFER, depth);
nuclear@0 43 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@0 44 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth);
nuclear@0 45
nuclear@0 46 return true;
nuclear@0 47 }
nuclear@0 48
nuclear@0 49 bool RenderTarget::resize(int xsz, int ysz)
nuclear@0 50 {
nuclear@0 51 if(!fbo) {
nuclear@0 52 return create(xsz, ysz);
nuclear@0 53 }
nuclear@0 54
nuclear@0 55 this->xsz = xsz;
nuclear@0 56 this->ysz = ysz;
nuclear@0 57 int new_tex_xsz = next_pow2(xsz);
nuclear@0 58 int new_tex_ysz = next_pow2(ysz);
nuclear@0 59
nuclear@0 60 if(tex_xsz != new_tex_xsz || tex_ysz != new_tex_ysz) {
nuclear@0 61 glBindTexture(GL_TEXTURE_2D, color);
nuclear@0 62 glTexImage2D(GL_TEXTURE_2D, 0, tex_fmt, tex_xsz, tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
nuclear@0 63
nuclear@0 64 glBindRenderbuffer(GL_RENDERBUFFER, depth);
nuclear@0 65 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@0 66
nuclear@0 67 tex_xsz = new_tex_xsz;
nuclear@0 68 tex_ysz = new_tex_ysz;
nuclear@0 69 }
nuclear@0 70 return true;
nuclear@0 71 }
nuclear@0 72
nuclear@0 73 void RenderTarget::destroy()
nuclear@0 74 {
nuclear@0 75 if(fbo) {
nuclear@0 76 glDeleteFramebuffers(1, &fbo);
nuclear@0 77 }
nuclear@0 78 if(color) {
nuclear@0 79 glDeleteTextures(1, &color);
nuclear@0 80 }
nuclear@0 81 if(depth) {
nuclear@0 82 glDeleteRenderbuffers(1, &depth);
nuclear@0 83 }
nuclear@0 84 fbo = color = depth = 0;
nuclear@0 85 }
nuclear@0 86
nuclear@0 87 bool RenderTarget::is_valid() const
nuclear@0 88 {
nuclear@0 89 return fbo != 0;
nuclear@0 90 }
nuclear@0 91
nuclear@0 92 unsigned int RenderTarget::get_texture() const
nuclear@0 93 {
nuclear@0 94 return color;
nuclear@0 95 }
nuclear@0 96
nuclear@0 97 int RenderTarget::get_width() const
nuclear@0 98 {
nuclear@0 99 return xsz;
nuclear@0 100 }
nuclear@0 101
nuclear@0 102 int RenderTarget::get_height() const
nuclear@0 103 {
nuclear@0 104 return ysz;
nuclear@0 105 }
nuclear@0 106
nuclear@0 107 int RenderTarget::get_tex_width() const
nuclear@0 108 {
nuclear@0 109 return tex_xsz;
nuclear@0 110 }
nuclear@0 111
nuclear@0 112 int RenderTarget::get_tex_height() const
nuclear@0 113 {
nuclear@0 114 return tex_ysz;
nuclear@0 115 }
nuclear@0 116
nuclear@0 117 void set_render_target(const RenderTarget *rtarg)
nuclear@0 118 {
nuclear@0 119 if(rtarg) {
nuclear@0 120 glBindFramebuffer(GL_FRAMEBUFFER, rtarg->color);
nuclear@0 121 } else {
nuclear@0 122 glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@0 123 }
nuclear@0 124 }
nuclear@0 125
nuclear@0 126 static int next_pow2(int x)
nuclear@0 127 {
nuclear@0 128 x--;
nuclear@0 129 x = (x >> 1) | x;
nuclear@0 130 x = (x >> 2) | x;
nuclear@0 131 x = (x >> 4) | x;
nuclear@0 132 x = (x >> 8) | x;
nuclear@0 133 x = (x >> 16) | x;
nuclear@0 134 return x + 1;
nuclear@0 135 }