1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/rtarg.cc	Tue Apr 07 11:16:56 2015 +0300
     1.3 @@ -0,0 +1,135 @@
     1.4 +#include "opengl.h"
     1.5 +#include "rtarg.h"
     1.6 +
     1.7 +static int next_pow2(int x);
     1.8 +
     1.9 +RenderTarget::RenderTarget()
    1.10 +{
    1.11 +	xsz = ysz = 0;
    1.12 +	fbo = color = depth = 0;
    1.13 +
    1.14 +	tex_fmt = 0;
    1.15 +	tex_xsz = tex_ysz = 0;
    1.16 +}
    1.17 +
    1.18 +RenderTarget::~RenderTarget()
    1.19 +{
    1.20 +	destroy();
    1.21 +}
    1.22 +
    1.23 +bool RenderTarget::create(int xsz, int ysz)
    1.24 +{
    1.25 +	destroy();
    1.26 +
    1.27 +	this->xsz = xsz;
    1.28 +	this->ysz = ysz;
    1.29 +
    1.30 +	tex_xsz = next_pow2(xsz);
    1.31 +	tex_ysz = next_pow2(ysz);
    1.32 +	tex_fmt = check_extension("GL_ARB_texture_float") ? GL_RGB16F : GL_RGB;
    1.33 +
    1.34 +	glGenFramebuffers(1, &fbo);
    1.35 +	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    1.36 +
    1.37 +	glGenTextures(1, &color);
    1.38 +	glBindTexture(GL_TEXTURE_2D, color);
    1.39 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    1.40 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    1.41 +	glTexImage2D(GL_TEXTURE_2D, 0, tex_fmt, tex_xsz, tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
    1.42 +	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color, 0);
    1.43 +
    1.44 +	glGenRenderbuffers(1, &depth);
    1.45 +	glBindRenderbuffer(GL_RENDERBUFFER, depth);
    1.46 +	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
    1.47 +	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth);
    1.48 +
    1.49 +	return true;
    1.50 +}
    1.51 +
    1.52 +bool RenderTarget::resize(int xsz, int ysz)
    1.53 +{
    1.54 +	if(!fbo) {
    1.55 +		return create(xsz, ysz);
    1.56 +	}
    1.57 +
    1.58 +	this->xsz = xsz;
    1.59 +	this->ysz = ysz;
    1.60 +	int new_tex_xsz = next_pow2(xsz);
    1.61 +	int new_tex_ysz = next_pow2(ysz);
    1.62 +
    1.63 +	if(tex_xsz != new_tex_xsz || tex_ysz != new_tex_ysz) {
    1.64 +		glBindTexture(GL_TEXTURE_2D, color);
    1.65 +		glTexImage2D(GL_TEXTURE_2D, 0, tex_fmt, tex_xsz, tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
    1.66 +
    1.67 +		glBindRenderbuffer(GL_RENDERBUFFER, depth);
    1.68 +		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
    1.69 +
    1.70 +		tex_xsz = new_tex_xsz;
    1.71 +		tex_ysz = new_tex_ysz;
    1.72 +	}
    1.73 +	return true;
    1.74 +}
    1.75 +
    1.76 +void RenderTarget::destroy()
    1.77 +{
    1.78 +	if(fbo) {
    1.79 +		glDeleteFramebuffers(1, &fbo);
    1.80 +	}
    1.81 +	if(color) {
    1.82 +		glDeleteTextures(1, &color);
    1.83 +	}
    1.84 +	if(depth) {
    1.85 +		glDeleteRenderbuffers(1, &depth);
    1.86 +	}
    1.87 +	fbo = color = depth = 0;
    1.88 +}
    1.89 +
    1.90 +bool RenderTarget::is_valid() const
    1.91 +{
    1.92 +	return fbo != 0;
    1.93 +}
    1.94 +
    1.95 +unsigned int RenderTarget::get_texture() const
    1.96 +{
    1.97 +	return color;
    1.98 +}
    1.99 +
   1.100 +int RenderTarget::get_width() const
   1.101 +{
   1.102 +	return xsz;
   1.103 +}
   1.104 +
   1.105 +int RenderTarget::get_height() const
   1.106 +{
   1.107 +	return ysz;
   1.108 +}
   1.109 +
   1.110 +int RenderTarget::get_tex_width() const
   1.111 +{
   1.112 +	return tex_xsz;
   1.113 +}
   1.114 +
   1.115 +int RenderTarget::get_tex_height() const
   1.116 +{
   1.117 +	return tex_ysz;
   1.118 +}
   1.119 +
   1.120 +void set_render_target(const RenderTarget *rtarg)
   1.121 +{
   1.122 +	if(rtarg) {
   1.123 +		glBindFramebuffer(GL_FRAMEBUFFER, rtarg->color);
   1.124 +	} else {
   1.125 +		glBindFramebuffer(GL_FRAMEBUFFER, 0);
   1.126 +	}
   1.127 +}
   1.128 +
   1.129 +static int next_pow2(int x)
   1.130 +{
   1.131 +	x--;
   1.132 +	x = (x >> 1) | x;
   1.133 +	x = (x >> 2) | x;
   1.134 +	x = (x >> 4) | x;
   1.135 +	x = (x >> 8) | x;
   1.136 +	x = (x >> 16) | x;
   1.137 +	return x + 1;
   1.138 +}