nuclear@44: #include <limits.h>
nuclear@78: #include <assert.h>
nuclear@15: #include "opengl.h"
nuclear@15: #include "renderer.h"
nuclear@23: #include "level.h"
nuclear@15: #include "sdr.h"
nuclear@15: #include "datapath.h"
nuclear@15: 
nuclear@41: static unsigned int load_sdr(const char *vfname, const char *pfname);
nuclear@72: static int round_pow2(int x);
nuclear@35: 
nuclear@41: Renderer *rend;
nuclear@18: 
nuclear@15: 
nuclear@41: Renderer::Renderer()
nuclear@41: {
nuclear@72: 	fbo = 0;
nuclear@72: 	rend_tex = rend_depth = 0;
nuclear@41: 	width = height = 0;
nuclear@72: 	tex_xsz = tex_ysz = 0;
nuclear@72: 	post_sdr = 0;
nuclear@41: }
nuclear@17: 
nuclear@41: Renderer::~Renderer()
nuclear@41: {
nuclear@72: 	if(post_sdr) {
nuclear@72: 		free_program(post_sdr);
nuclear@72: 	}
nuclear@72: 	if(rend_tex) {
nuclear@72: 		glDeleteTextures(1, &rend_tex);
nuclear@72: 	}
nuclear@72: 	if(rend_depth) {
nuclear@72: 		glDeleteRenderbuffersEXT(1, &rend_depth);
nuclear@72: 	}
nuclear@72: 	if(fbo) {
nuclear@72: 		glDeleteFramebuffersEXT(1, &fbo);
nuclear@72: 	}
nuclear@41: }
nuclear@17: 
nuclear@41: bool Renderer::init(int xsz, int ysz)
nuclear@41: {
nuclear@41: 	width = xsz;
nuclear@41: 	height = ysz;
nuclear@17: 
nuclear@72: 	if(!create_rtarg()) {
nuclear@72: 		return false;
nuclear@72: 	}
nuclear@72: 
nuclear@72: 	if(!(post_sdr = load_sdr("post.v.glsl", "post.p.glsl"))) {
nuclear@72: 		return false;
nuclear@72: 	}
nuclear@72: 
nuclear@72: 	if(!gradepal.create()) {
nuclear@72: 		return false;
nuclear@72: 	}
nuclear@72: 
nuclear@78: 	if(GLEW_ARB_framebuffer_sRGB) {
nuclear@78: 		glEnable(GL_FRAMEBUFFER_SRGB);
nuclear@78: 	}
nuclear@78: 
nuclear@41: 	rend = this;
nuclear@41: 	return true;
nuclear@41: }
nuclear@15: 
nuclear@41: int Renderer::get_tangent_location() const
nuclear@41: {
nuclear@41: 	return -1;
nuclear@41: }
nuclear@15: 
nuclear@41: unsigned int Renderer::get_current_program() const
nuclear@41: {
nuclear@41: 	return 0;
nuclear@41: }
nuclear@21: 
nuclear@41: void Renderer::resize(int xsz, int ysz)
nuclear@41: {
nuclear@41: 	width = xsz;
nuclear@41: 	height = ysz;
nuclear@72: 
nuclear@72: 	// if we need a bigger rendertarget ...
nuclear@72: 	if(xsz > tex_xsz || ysz > tex_ysz) {
nuclear@72: 		tex_xsz = round_pow2(xsz);
nuclear@72: 		tex_ysz = round_pow2(ysz);
nuclear@72: 
nuclear@72: 		// ... resize the render target
nuclear@72: 		glBindTexture(GL_TEXTURE_2D, rend_tex);
nuclear@78: 		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@72: 
nuclear@72: 		// ... resize the depth buffer
nuclear@72: 		glBindRenderbufferEXT(GL_RENDERBUFFER, rend_depth);
nuclear@72: 		glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@72: 	}
nuclear@41: }
nuclear@21: 
nuclear@62: void Renderer::render_pre(const Level *level) const
nuclear@62: {
nuclear@62: 	glEnable(GL_FOG);
nuclear@62: 	glFogi(GL_FOG_MODE, GL_LINEAR);
nuclear@62: 	glFogf(GL_FOG_START, 3.0f);
nuclear@62: 	glFogf(GL_FOG_END, 6.0f);
nuclear@62: 	// TODO level->draw_pre();
nuclear@72: 
nuclear@72: 	// bind the render target
nuclear@72: 	glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@72: 	glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rend_tex, 0);
nuclear@72: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@72: 
nuclear@72: 	CHECKGLERR;
nuclear@62: }
nuclear@62: 
nuclear@62: void Renderer::render_post(const Level *level) const
nuclear@62: {
nuclear@62: 	level->draw_post();
nuclear@72: 	CHECKGLERR;
nuclear@72: 
nuclear@72: 	glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@72: 
nuclear@72: 	// draw the rendered output
nuclear@72: 	glActiveTextureARB(GL_TEXTURE0);
nuclear@72: 	glBindTexture(GL_TEXTURE_2D, rend_tex);
nuclear@72: 	glEnable(GL_TEXTURE_2D);
nuclear@72: 
nuclear@72: 	// use the color-grading palette
nuclear@72: 	glActiveTextureARB(GL_TEXTURE1);
nuclear@72: 	glBindTexture(GL_TEXTURE_3D, gradepal.get_texture());
nuclear@72: 	glEnable(GL_TEXTURE_3D);
nuclear@72: 
nuclear@72: 	glUseProgram(post_sdr);
nuclear@72: 	set_uniform_int(post_sdr, "fbtex", 0);
nuclear@72: 	set_uniform_int(post_sdr, "paltex", 1);
nuclear@72: 
nuclear@72: 	glBegin(GL_QUADS);
nuclear@72: 	glTexCoord2f(0, 0);
nuclear@72: 	glVertex2f(-1, -1);
nuclear@72: 	glTexCoord2f((float)width / tex_xsz, 0);
nuclear@72: 	glVertex2f(1, -1);
nuclear@72: 	glTexCoord2f((float)width / tex_xsz, (float)height / tex_ysz);
nuclear@72: 	glVertex2f(1, 1);
nuclear@72: 	glTexCoord2f(0, (float)height / tex_ysz);
nuclear@72: 	glVertex2f(-1, 1);
nuclear@72: 	glEnd();
nuclear@72: 	glUseProgram(0);
nuclear@72: 
nuclear@73: 	glActiveTextureARB(GL_TEXTURE1);
nuclear@73: 	glDisable(GL_TEXTURE_3D);
nuclear@72: 	glActiveTextureARB(GL_TEXTURE0);
nuclear@73: 	glDisable(GL_TEXTURE_2D);
nuclear@72: 
nuclear@72: 	CHECKGLERR;
nuclear@72: }
nuclear@72: 
nuclear@72: static const char *fbstname[] = {
nuclear@72: 	"GL_FRAMEBUFFER_COMPLETE",
nuclear@72: 	"GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",
nuclear@72: 	"GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",
nuclear@72: 	"no such fbo error",
nuclear@72: 	"GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",
nuclear@72: 	"GL_FRAMEBUFFER_INCOMPLETE_FORMATS",
nuclear@72: 	"GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",
nuclear@72: 	"GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",
nuclear@72: 	"GL_FRAMEBUFFER_UNSUPPORTED"
nuclear@72: };
nuclear@72: 
nuclear@72: bool Renderer::create_rtarg()
nuclear@72: {
nuclear@72: 	unsigned int clamp = GLEW_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;
nuclear@72: 
nuclear@72: 	tex_xsz = round_pow2(width);
nuclear@72: 	tex_ysz = round_pow2(height);
nuclear@72: 
nuclear@72: 	if(!glGenFramebuffersEXT) {
nuclear@72: 		fprintf(stderr, "FBO support missing!\n");
nuclear@72: 		return false;
nuclear@72: 	}
nuclear@72: 	glGenFramebuffersEXT(1, &fbo);
nuclear@72: 	glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@72: 
nuclear@72: 	// create the render target
nuclear@72: 	glGenTextures(1, &rend_tex);
nuclear@72: 	glBindTexture(GL_TEXTURE_2D, rend_tex);
nuclear@72: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);
nuclear@72: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);
nuclear@72: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@72: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@78: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@72: 
nuclear@72: 	glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rend_tex, 0);
nuclear@72: 
nuclear@72: 	// create depth buffer
nuclear@72: 	glGenRenderbuffersEXT(1, &rend_depth);
nuclear@72: 	glBindRenderbufferEXT(GL_RENDERBUFFER, rend_depth);
nuclear@72: 	glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@72: 
nuclear@72: 	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rend_depth);
nuclear@72: 
nuclear@72: 	int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
nuclear@72: 	if(fbst != GL_FRAMEBUFFER_COMPLETE) {
nuclear@72: 		fprintf(stderr, "incomplete fbo: %u (%s)\n", fbo, fbstname[fbst - GL_FRAMEBUFFER_COMPLETE]);
nuclear@72: 		return false;
nuclear@72: 	}
nuclear@72: 	CHECKGLERR;
nuclear@72: 
nuclear@72: 	glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@72: 	return true;
nuclear@62: }
nuclear@62: 
nuclear@74: GradePalette *Renderer::get_grade_palette()
nuclear@74: {
nuclear@74: 	return &gradepal;
nuclear@74: }
nuclear@74: 
nuclear@74: const GradePalette *Renderer::get_grade_palette() const
nuclear@74: {
nuclear@74: 	return &gradepal;
nuclear@74: }
nuclear@74: 
nuclear@41: 
nuclear@41: // ---- fallback forward renderer ----
nuclear@41: FwdRenderer::FwdRenderer()
nuclear@17: {
nuclear@41: 	sdrprog = 0;
nuclear@41: 	tang_attr = -1;
nuclear@41: }
nuclear@41: 
nuclear@41: FwdRenderer::~FwdRenderer()
nuclear@41: {
nuclear@41: 	if(sdrprog) {
nuclear@41: 		free_program(sdrprog);
nuclear@32: 	}
nuclear@41: }
nuclear@21: 
nuclear@41: bool FwdRenderer::init(int xsz, int ysz)
nuclear@41: {
nuclear@72: 	if(!Renderer::init(xsz, ysz)) {
nuclear@72: 		return false;
nuclear@72: 	}
nuclear@19: 
nuclear@41: 	if(glUseProgram && (sdrprog = load_sdr("fallback.v.glsl", "fallback.p.glsl"))) {
nuclear@41: 		tang_attr = get_attrib_loc(sdrprog, "attr_tangent");
nuclear@41: 		set_uniform_int(sdrprog, "tex_dif", 0);
nuclear@41: 		set_uniform_int(sdrprog, "tex_norm", 1);
nuclear@23: 	}
nuclear@17: 	return true;
nuclear@17: }
nuclear@17: 
nuclear@41: int FwdRenderer::get_tangent_location() const
nuclear@17: {
nuclear@41: 	return tang_attr;
nuclear@17: }
nuclear@17: 
nuclear@41: unsigned int FwdRenderer::get_current_program() const
nuclear@33: {
nuclear@41: 	return sdrprog;
nuclear@33: }
nuclear@33: 
nuclear@41: void FwdRenderer::render(const Level *level) const
nuclear@35: {
nuclear@41: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@51: 	glEnable(GL_LIGHTING);
nuclear@62: 
nuclear@62: 	render_pre(level);
nuclear@51: 
nuclear@41: 	glUseProgram(sdrprog);
nuclear@62: 	level->draw();
nuclear@62: 	glUseProgram(0);
nuclear@35: 
nuclear@62: 	render_post(level);
nuclear@46: 
nuclear@41: 	glPopAttrib();
nuclear@17: }
nuclear@17: 
nuclear@18: static unsigned int load_sdr(const char *vfname, const char *pfname)
nuclear@15: {
nuclear@18: 	unsigned int prog;
nuclear@15: 
nuclear@63: 	std::string vsfile = datafile_path(vfname);
nuclear@63: 	std::string psfile = datafile_path(pfname);
nuclear@63: 
nuclear@63: 	const char *vs = vsfile.empty() ? 0 : vsfile.c_str();
nuclear@63: 	const char *ps = psfile.empty() ? 0 : psfile.c_str();
nuclear@63: 
nuclear@63: 	if(!(prog = create_program_load(vs, ps))) {
nuclear@63: 		fprintf(stderr, "failed to load shader program (%s, %s)\n", vs, ps);
nuclear@18: 		return 0;
nuclear@15: 	}
nuclear@18: 	return prog;
nuclear@15: }
nuclear@72: 
nuclear@72: static int round_pow2(int x)
nuclear@72: {
nuclear@72: 	x--;
nuclear@72: 	x = (x >> 1) | x;
nuclear@72: 	x = (x >> 2) | x;
nuclear@72: 	x = (x >> 4) | x;
nuclear@72: 	x = (x >> 8) | x;
nuclear@72: 	x = (x >> 16) | x;
nuclear@72: 	return x + 1;
nuclear@72: }
nuclear@72: