nuclear@0: #include <stdio.h>
nuclear@8: #include <string.h>
nuclear@2: #include <math.h>
nuclear@0: #include <assert.h>
nuclear@12: 
nuclear@12: #ifndef __APPLE__
nuclear@12: #include <GL/gl.h>
nuclear@12: #include <GL/glu.h>
nuclear@12: #else
nuclear@12: #include <OpenGL/gl.h>
nuclear@12: #include <OpenGL/glu.h>
nuclear@12: #endif
nuclear@12: 
nuclear@0: #include "ocl.h"
nuclear@9: #include "mesh.h"
nuclear@0: 
nuclear@12: // kernel arguments
nuclear@12: enum {
nuclear@12: 	KARG_FRAMEBUFFER,
nuclear@12: 	KARG_RENDER_INFO,
nuclear@12: 	KARG_FACES,
nuclear@12: 	KARG_MATLIB,
nuclear@12: 	KARG_LIGHTS,
nuclear@12: 	KARG_PRIM_RAYS,
nuclear@12: 	KARG_XFORM,
nuclear@12: 	KARG_INVTRANS_XFORM
nuclear@12: };
John@11: 
nuclear@2: struct RendInfo {
nuclear@2: 	int xsz, ysz;
nuclear@9: 	int num_faces, num_lights;
nuclear@2: 	int max_iter;
nuclear@12: };
nuclear@2: 
nuclear@1: struct Ray {
nuclear@8: 	float origin[4], dir[4];
nuclear@12: };
nuclear@1: 
nuclear@3: struct Light {
nuclear@8: 	float pos[4], color[4];
nuclear@12: };
nuclear@1: 
nuclear@3: static Ray get_primary_ray(int x, int y, int w, int h, float vfov_deg);
nuclear@3: 
nuclear@3: static Ray *prim_rays;
nuclear@3: static CLProgram *prog;
nuclear@3: static int global_size;
nuclear@3: 
nuclear@9: static Face faces[] = {
nuclear@9: 	{/* face0 */
nuclear@9: 		{
nuclear@12: 			{{-1, 0, 0, 0}, {0, 0, -1, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}},
nuclear@12: 			{{0, 1, 0, 0}, {0, 0, -1, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}},
nuclear@12: 			{{1, 0, 0, 0}, {0, 0, -1, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}}
nuclear@9: 		},
nuclear@12: 		{0, 0, -1, 0}, 0, {0, 0, 0}
nuclear@9: 	},
nuclear@9: 	{/* face1 */
nuclear@9: 		{
nuclear@12: 			{{-5, 0, -3, 0}, {0, 1, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}},
nuclear@12: 			{{0, 0, 3, 0}, {0, 1, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}},
nuclear@12: 			{{5, 0, -3, 0}, {0, 1, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}}
nuclear@9: 		},
nuclear@12: 		{0, 1, 0, 0}, 1, {0, 0, 0}
nuclear@9: 	}
nuclear@9: };
nuclear@9: 
nuclear@9: static Material matlib[] = {
nuclear@12: 	{{1, 0, 0, 1}, {1, 1, 1, 1}, 0, 0, 60.0, 0},
nuclear@12: 	{{0.2, 0.8, 0.3, 1}, {0, 0, 0, 0}, 0, 0, 0, 0}
nuclear@4: };
nuclear@4: 
nuclear@4: static Light lightlist[] = {
nuclear@12: 	{{-10, 10, -20, 0}, {1, 1, 1, 1}}
nuclear@4: };
nuclear@4: 
nuclear@7: 
nuclear@4: static RendInfo rinf;
nuclear@4: 
nuclear@4: 
nuclear@12: bool init_renderer(int xsz, int ysz)
nuclear@0: {
nuclear@4: 	// render info
nuclear@4: 	rinf.xsz = xsz;
nuclear@4: 	rinf.ysz = ysz;
nuclear@9: 	rinf.num_faces = sizeof faces / sizeof *faces;
nuclear@4: 	rinf.num_lights = sizeof lightlist / sizeof *lightlist;
nuclear@4: 	rinf.max_iter = 6;
nuclear@4: 
nuclear@3: 	/* calculate primary rays */
nuclear@3: 	prim_rays = new Ray[xsz * ysz];
nuclear@2: 
nuclear@2: 	for(int i=0; i<ysz; i++) {
nuclear@2: 		for(int j=0; j<xsz; j++) {
nuclear@2: 			prim_rays[i * xsz + j] = get_primary_ray(j, i, xsz, ysz, 45.0);
nuclear@2: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@2: 	/* setup opencl */
nuclear@3: 	prog = new CLProgram("render");
nuclear@3: 	if(!prog->load("rt.cl")) {
nuclear@8: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@3: 	/* setup argument buffers */
nuclear@12: 	prog->set_arg_buffer(KARG_FRAMEBUFFER, ARG_WR, xsz * ysz * 4 * sizeof(float));
nuclear@12: 	prog->set_arg_buffer(KARG_RENDER_INFO, ARG_RD, sizeof rinf, &rinf);
nuclear@12: 	prog->set_arg_buffer(KARG_FACES, ARG_RD, sizeof faces, faces);
nuclear@12: 	prog->set_arg_buffer(KARG_MATLIB, ARG_RD, sizeof matlib, matlib);
nuclear@12: 	prog->set_arg_buffer(KARG_LIGHTS, ARG_RD, sizeof lightlist, lightlist);
nuclear@12: 	prog->set_arg_buffer(KARG_PRIM_RAYS, ARG_RD, xsz * ysz * sizeof *prim_rays, prim_rays);
nuclear@12: 	prog->set_arg_buffer(KARG_XFORM, ARG_RD, 16 * sizeof(float));
nuclear@12: 	prog->set_arg_buffer(KARG_INVTRANS_XFORM, ARG_RD, 16 * sizeof(float));
nuclear@12: 
nuclear@12: 	delete [] prim_rays;
nuclear@2: 
nuclear@3: 	global_size = xsz * ysz;
nuclear@3: 	return true;
nuclear@3: }
nuclear@3: 
nuclear@3: void destroy_renderer()
nuclear@3: {
nuclear@3: 	delete prog;
nuclear@3: }
nuclear@3: 
nuclear@3: bool render()
nuclear@3: {
nuclear@3: 	if(!prog->run(1, global_size)) {
nuclear@3: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@3: 	CLMemBuffer *mbuf = prog->get_arg_buffer(0);
nuclear@12: 	void *fb = map_mem_buffer(mbuf, MAP_RD);
nuclear@12: 	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rinf.xsz, rinf.ysz, GL_RGBA, GL_FLOAT, fb);
nuclear@2: 	unmap_mem_buffer(mbuf);
nuclear@3: 	return true;
nuclear@0: }
nuclear@2: 
nuclear@12: void dbg_render_gl()
nuclear@8: {
nuclear@12: 	glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);
nuclear@8: 
nuclear@12: 	glDisable(GL_TEXTURE_2D);
nuclear@12: 	glEnable(GL_DEPTH_TEST);
nuclear@12: 
nuclear@12: 	glMatrixMode(GL_PROJECTION);
nuclear@12: 	glPushMatrix();
nuclear@12: 	glLoadIdentity();
nuclear@12: 	gluPerspective(45.0, (float)rinf.xsz / (float)rinf.ysz, 0.5, 1000.0);
nuclear@12: 
nuclear@12: 	glBegin(GL_TRIANGLES);
nuclear@12: 	for(int i=0; i<rinf.num_faces; i++) {
nuclear@12: 		Material *mat = matlib + faces[i].matid;
nuclear@12: 		glColor3f(mat->kd[0], mat->kd[1], mat->kd[2]);
nuclear@12: 
nuclear@12: 		for(int j=0; j<3; j++) {
nuclear@12: 			float *pos = faces[i].v[j].pos;
nuclear@12: 			glVertex3f(pos[0], pos[1], pos[2]);
nuclear@12: 		}
nuclear@12: 	}
nuclear@12: 	glEnd();
nuclear@12: 
nuclear@12: 	glPopMatrix();
nuclear@12: 	glPopAttrib();
nuclear@12: }
nuclear@12: 
nuclear@12: void set_xform(float *matrix, float *invtrans)
nuclear@12: {
nuclear@12: 	CLMemBuffer *mbuf_xform = prog->get_arg_buffer(KARG_XFORM);
nuclear@12: 	CLMemBuffer *mbuf_invtrans = prog->get_arg_buffer(KARG_INVTRANS_XFORM);
nuclear@12: 	assert(mbuf_xform && mbuf_invtrans);
nuclear@12: 
nuclear@12: 	float *mem = (float*)map_mem_buffer(mbuf_xform, MAP_WR);
nuclear@12: 	memcpy(mem, matrix, 16 * sizeof *mem);
nuclear@12: 	printf("-- xform:\n");
nuclear@12: 	for(int i=0; i<16; i++) {
nuclear@12: 		printf("%2.3f\t", mem[i]);
nuclear@12: 		if(i % 4 == 3) putchar('\n');
nuclear@12: 	}
nuclear@12: 	unmap_mem_buffer(mbuf_xform);
nuclear@12: 
nuclear@12: 	mem = (float*)map_mem_buffer(mbuf_invtrans, MAP_WR);
nuclear@12: 	memcpy(mem, invtrans, 16 * sizeof *mem);
nuclear@12: 	printf("-- inverse-transpose:\n");
nuclear@12: 	for(int i=0; i<16; i++) {
nuclear@12: 		printf("%2.3f\t", mem[i]);
nuclear@12: 		if(i % 4 == 3) putchar('\n');
nuclear@12: 	}
nuclear@12: 	unmap_mem_buffer(mbuf_invtrans);
nuclear@8: }
nuclear@8: 
nuclear@3: static Ray get_primary_ray(int x, int y, int w, int h, float vfov_deg)
nuclear@2: {
nuclear@2: 	float vfov = M_PI * vfov_deg / 180.0;
nuclear@2: 	float aspect = (float)w / (float)h;
nuclear@2: 
nuclear@2: 	float ysz = 2.0;
nuclear@2: 	float xsz = aspect * ysz;
nuclear@2: 
nuclear@2: 	float px = ((float)x / (float)w) * xsz - xsz / 2.0;
nuclear@2: 	float py = 1.0 - ((float)y / (float)h) * ysz;
nuclear@2: 	float pz = 1.0 / tan(0.5 * vfov);
nuclear@2: 
nuclear@4: 	px *= 100.0;
nuclear@4: 	py *= 100.0;
nuclear@4: 	pz *= 100.0;
nuclear@2: 
nuclear@12: 	Ray ray = {{0, 0, 0, 1}, {px, py, -pz, 1}};
nuclear@2: 	return ray;
nuclear@2: }