1.1 --- a/prototype/src/renderer.cc	Tue Aug 21 03:17:48 2012 +0300
     1.2 +++ b/prototype/src/renderer.cc	Tue Aug 21 04:29:49 2012 +0300
     1.3 @@ -14,7 +14,7 @@
     1.4  static int round_pow2(int x);
     1.5  
     1.6  
     1.7 -#define MRT_COUNT	1
     1.8 +#define MRT_COUNT	4
     1.9  static unsigned int mrt_tex[MRT_COUNT];
    1.10  
    1.11  static unsigned int mrt_prog;
    1.12 @@ -37,9 +37,20 @@
    1.13  
    1.14  bool init_renderer(int xsz, int ysz)
    1.15  {
    1.16 +	int max_draw_buf;
    1.17 +
    1.18 +	glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buf);
    1.19 +	CHECKGLERR;
    1.20 +	printf("max draw buffers: %d\n", max_draw_buf);
    1.21 +	if(max_draw_buf < MRT_COUNT) {
    1.22 +		fprintf(stderr, "OpenGL implementation doesn't support enough draw buffers\n");
    1.23 +		return false;
    1.24 +	}
    1.25 +
    1.26  	if(!create_fbo(xsz, ysz)) {
    1.27  		return false;
    1.28  	}
    1.29 +	CHECKGLERR;
    1.30  
    1.31  	if(!(mrt_prog = load_sdr("mrt.v.glsl", "mrt.p.glsl"))) {
    1.32  		return false;
    1.33 @@ -63,8 +74,17 @@
    1.34  {
    1.35  	int loc;
    1.36  
    1.37 +	static GLenum draw_bufs[] = {
    1.38 +		GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT,
    1.39 +		GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT,
    1.40 +		GL_COLOR_ATTACHMENT4_EXT, GL_COLOR_ATTACHMENT5_EXT,
    1.41 +		GL_COLOR_ATTACHMENT6_EXT, GL_COLOR_ATTACHMENT7_EXT
    1.42 +	};
    1.43 +
    1.44  	// render into the MRT buffers
    1.45  	glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
    1.46 +	glDrawBuffersARB(MRT_COUNT, draw_bufs);
    1.47 +
    1.48  	glUseProgram(mrt_prog);
    1.49  	draw_func();
    1.50  	glUseProgram(0);
    1.51 @@ -76,12 +96,19 @@
    1.52  
    1.53  	glDisable(GL_LIGHTING);
    1.54  	glDisable(GL_DEPTH_TEST);
    1.55 -	glBindTexture(GL_TEXTURE_2D, mrt_tex[0]);
    1.56 -	glEnable(GL_TEXTURE_2D);
    1.57  
    1.58  	glUseProgram(deferred_debug);
    1.59 -	if((loc = glGetUniformLocation(deferred_debug, "tex0")) != -1) {
    1.60 -		glUniform1i(loc, 0);
    1.61 +	for(int i=0; i<MRT_COUNT; i++) {
    1.62 +		char uname[32];
    1.63 +
    1.64 +		sprintf(uname, "mrt%d", i);
    1.65 +		if((loc = glGetUniformLocation(deferred_debug, uname)) != -1) {
    1.66 +			glUniform1i(loc, i);
    1.67 +		}
    1.68 +
    1.69 +		glActiveTexture(GL_TEXTURE0 + i);
    1.70 +		glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
    1.71 +		glEnable(GL_TEXTURE_2D);
    1.72  	}
    1.73  	if((loc = glGetUniformLocation(deferred_debug, "tex_scale")) != -1) {
    1.74  		glUniform2f(loc, (float)fb_xsz / tex_xsz, (float)fb_ysz / tex_ysz);
    1.75 @@ -98,6 +125,11 @@
    1.76  	glVertex2f(-1, 1);
    1.77  	glEnd();
    1.78  
    1.79 +	for(int i=0; i<MRT_COUNT; i++) {
    1.80 +		glActiveTexture(GL_TEXTURE0 + MRT_COUNT - i - 1);
    1.81 +		glDisable(GL_TEXTURE_2D);
    1.82 +	}
    1.83 +
    1.84  	glUseProgram(0);
    1.85  	glPopAttrib();
    1.86  }