nuclear@24: #include <assert.h>
nuclear@18: #include <GL/glew.h>
nuclear@18: #include "demo.h"
nuclear@18: #include "sdr.h"
nuclear@18: #include "volray.h"
nuclear@18: 
nuclear@18: #define SZ	128
nuclear@18: 
nuclear@18: static Volume *vol;
nuclear@18: static unsigned int sdr_mballs;
nuclear@18: static unsigned int fbo;
nuclear@18: 
nuclear@18: bool init_demo()
nuclear@18: {
nuclear@18: 	if(!(sdr_mballs = create_program_load("sdr/demo.v.glsl", "sdr/demo.p.glsl"))) {
nuclear@18: 		return false;
nuclear@18: 	}
nuclear@18: 
nuclear@18: 	vol = new Volume;
nuclear@18: 	vol->create(SZ, SZ, SZ);
nuclear@18: 	volray_setvolume(vol);
nuclear@18: 
nuclear@24: 	assert(glGenFramebuffersEXT);
nuclear@24: 	assert(glBindFramebufferEXT);
nuclear@24: 	assert(glFramebufferTexture3DEXT);
nuclear@24: 	assert(glCheckFramebufferStatusEXT);
nuclear@24: 
nuclear@24: 	glGenFramebuffersEXT(1, &fbo);
nuclear@24: 	glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@24: 	glFramebufferTexture3DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_3D,
nuclear@18: 			vol->get_texture(), 0, 0);
nuclear@18: 
nuclear@24: 	unsigned int stat = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
nuclear@18: 	if(stat != GL_FRAMEBUFFER_COMPLETE) {
nuclear@18: 		printf("incomplete framebuffer: %u\n", stat);
nuclear@18: 		delete vol;
nuclear@18: 		return false;
nuclear@18: 	}
nuclear@24: 	glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@18: 
nuclear@18: 	return true;
nuclear@18: }
nuclear@18: 
nuclear@18: void draw_demo()
nuclear@18: {
nuclear@18: 	if(volray_getvolume() != vol) {
nuclear@18: 		return;
nuclear@18: 	}
nuclear@18: 
nuclear@21: 	glPushAttrib(GL_VIEWPORT_BIT);
nuclear@21: 	glViewport(0, 0, SZ, SZ);
nuclear@21: 
nuclear@24: 	glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@18: 	bind_program(sdr_mballs);
nuclear@18: 
nuclear@18: 	for(int i=0; i<SZ; i++) {
nuclear@24: 		glFramebufferTexture3DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_3D,
nuclear@18: 				vol->get_texture(), 0, i);
nuclear@18: 
nuclear@21: 		float z = (float)i / (float)SZ;
nuclear@21: 
nuclear@18: 		glBegin(GL_QUADS);
nuclear@21: 		glTexCoord3f(0, 0, z);
nuclear@18: 		glVertex2f(-1, -1);
nuclear@21: 		glTexCoord3f(1, 0, z);
nuclear@18: 		glVertex2f(1, -1);
nuclear@21: 		glTexCoord3f(1, 1, z);
nuclear@18: 		glVertex2f(1, 1);
nuclear@21: 		glTexCoord3f(0, 1, z);
nuclear@18: 		glVertex2f(-1, 1);
nuclear@18: 		glEnd();
nuclear@18: 	}
nuclear@18: 
nuclear@18: 	bind_program(0);
nuclear@24: 	glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@21: 
nuclear@21: 	glPopAttrib();
nuclear@18: }