Open source Star Ruler 2 source code!

source/game/render/gl_framebuffer.cpp

@@ -0,0 +1,137 @@
+#include "gl_framebuffer.h"
+#include "main/logging.h"
+#include "main/references.h"
+
+namespace render {
+
+class DummyTexture : public Texture {
+	GLuint glName;
+public:
+	DummyTexture(GLuint name) : glName(name) {
+		type = TT_2D;
+		hasMipMaps = false;
+		loaded = true;
+	}
+
+	virtual bool isPixelActive(vec2i px) const { return false; }
+
+	virtual void loadStart(Image& image, bool mipmap = true, bool cachePixels = false, unsigned lod = 0) {}
+	virtual void loadPartial(Image& image, const recti& pixels, bool cachePixels = false, unsigned lod = 0) {}
+	virtual void loadFinish(bool mipmap, unsigned lod = 0) {}
+
+	virtual void load(Image& image, bool mipmap = true, bool cachePixels = false) {}
+	virtual void save(Image& image) const {}
+	virtual void bind() { glBindTexture(GL_TEXTURE_2D, glName); }
+	virtual unsigned getID() const { return glName; }
+
+	virtual unsigned getTextureBytes() const { return 0; }
+};
+
+glFrameBuffer::glFrameBuffer(const vec2i& Size) {
+	devices.render->reportErrors();
+
+	type = TT_2D;
+	loaded = true;
+
+	size = Size;
+	hasMipMaps = false;
+	glGenFramebuffers(1, &buffer);
+	glBindFramebuffer(GL_FRAMEBUFFER, buffer);
+	prevRenderState.filterMin = TF_Nearest;
+	prevRenderState.filterMag = TF_Nearest;
+
+	textures = new GLuint[2];
+	glGenTextures(2, textures);
+
+	glBindTexture(GL_TEXTURE_2D, textures[0]);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Size.width, Size.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glBindTexture(GL_TEXTURE_2D, 0);
+
+	glBindTexture(GL_TEXTURE_2D, textures[1]);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, Size.width, Size.height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_NONE);
+	glBindTexture(GL_TEXTURE_2D, 0);
+
+	devices.render->reportErrors("setting framebuffer parameters");
+
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textures[0], 0);
+
+	devices.render->reportErrors("creating framebuffer color attachment");
+
+	renderBuffers = new GLuint[1];
+	//glGenRenderbuffers(1, renderBuffers);
+	//glBindRenderbuffer(GL_RENDERBUFFER, renderBuffers[0]);
+	//glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, Size.width, Size.height);
+	//glBindRenderbuffer(GL_RENDERBUFFER, 0);
+
+	//glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, renderBuffers[0]);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, textures[1], 0);
+
+	depthTexture = new DummyTexture(textures[1]);
+
+	devices.render->reportErrors("creating framebuffer depth attachment");
+
+	auto state = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+	if(state != GL_FRAMEBUFFER_COMPLETE)
+		error("Incomplete framebuffer: %d", state);
+
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+glFrameBuffer::~glFrameBuffer() {
+	glDeleteFramebuffers(1, &buffer);
+	glDeleteTextures(2, textures); delete[] textures;
+	//glDeleteRenderbuffers(1, renderBuffers);
+	delete[] renderBuffers;
+	delete depthTexture;
+}
+
+void glFrameBuffer::bind() {
+	glBindTexture(GL_TEXTURE_2D, textures[0]);
+}
+
+unsigned glFrameBuffer::getID() const {
+	return textures[0];
+}
+
+void glFrameBuffer::setAsTarget() {
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, buffer);
+	glViewport(0,0,size.width, size.height);
+}
+
+void glFrameBuffer::save(Image& image) const {
+	image.resize(size.width, size.height, FMT_RGB);
+	glBindTexture(GL_TEXTURE_2D, textures[0]);
+	glGetTexImage(GL_TEXTURE_2D, 0, GL_RGB, GL_UNSIGNED_BYTE, image.rgb);
+}
+
+void glFrameBuffer::load(Image& img, bool mipmap, bool cachePixels) {
+	throw "Cannot load framebuffer from image.";
+}
+
+void glFrameBuffer::loadStart(Image& image, bool mipmap, bool cachePixels, unsigned lod) {
+	throw "Cannot load framebuffer from image.";
+}
+
+void glFrameBuffer::loadPartial(Image& image, const recti& pixels, bool cachePixels, unsigned lod) {
+	throw "Cannot load framebuffer from image.";
+}
+
+void glFrameBuffer::loadFinish(bool mipmap, unsigned lod) {
+	throw "Cannot load framebuffer from image.";
+}
+
+bool glFrameBuffer::isPixelActive(vec2i px) const {
+	throw "Cannot get framebuffer pixels.";
+}
+
+unsigned glFrameBuffer::getTextureBytes() const {
+	//4 bytes for RGBA, 3 bytes for 24 bit z buffer
+	return size.width * size.height * 7;
+}
+
+};