Block animation

src/graphics/TextureAnimation.cpp

@@ -0,0 +1,52 @@
+#include "TextureAnimation.h"
+#include "Texture.h"
+#include "Framebuffer.h"
+
+#include <GL\glew.h>
+#include <unordered_set>
+
+TextureAnimator::TextureAnimator() :
+	frameBuffer(new Framebuffer(1u, 1u))
+{
+}
+
+TextureAnimator::~TextureAnimator() {
+	delete frameBuffer;
+}
+
+void TextureAnimator::addAnimations(const std::vector<TextureAnimation>& animations) {
+	for (const auto& elem : animations) {
+		addAnimation(elem);
+	}
+}
+
+void TextureAnimator::update(float delta) {
+	std::unordered_set<uint> changedTextures;
+
+	frameBuffer->bind();
+	for (auto& elem : animations) {
+		if (changedTextures.find(elem.dstTexture->id) == changedTextures.end()) changedTextures.insert(elem.dstTexture->id);
+		elem.timer -= delta;
+		Frame& frame = elem.frames[elem.currentFrame];
+		if (elem.timer <= 0) {
+			elem.timer = frame.duration;
+			elem.currentFrame++;
+			if (elem.currentFrame >= elem.frames.size()) elem.currentFrame = 0;
+
+			glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, elem.srcTexture->id, 0);
+			glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, elem.dstTexture->id, 0);
+			glDrawBuffer(GL_COLOR_ATTACHMENT1);
+
+			float srcPosY = elem.srcTexture->height - frame.size.y - frame.srcPos.y; // vertical flip
+
+			glBlitFramebuffer(frame.srcPos.x, srcPosY,			frame.srcPos.x + frame.size.x,	srcPosY + frame.size.y,
+							  frame.dstPos.x, frame.dstPos.y,	frame.dstPos.x + frame.size.x,	frame.dstPos.y + frame.size.y,
+							  GL_COLOR_BUFFER_BIT, GL_NEAREST);
+		}
+	}
+	for (auto& elem : changedTextures) {
+		glBindTexture(GL_TEXTURE_2D, elem);
+		glGenerateMipmap(GL_TEXTURE_2D);
+	}
+	glBindTexture(GL_TEXTURE_2D, 0);
+}