Migrate OpenGL specific headers to renderer_gl

src/core/renderer_gl/gl_state.cpp

@@ -0,0 +1,53 @@
+#include "renderer_gl/gl_state.hpp"
+
+void GLStateManager::resetBlend() {
+	blendEnabled = false;
+	OpenGL::disableBlend();
+}
+
+void GLStateManager::resetColourMask() {
+	redMask = greenMask = blueMask = alphaMask = true;
+	OpenGL::setColourMask(redMask, greenMask, blueMask, alphaMask);
+}
+
+void GLStateManager::resetDepth() {
+	depthEnabled = false;
+	depthMask = true;
+	depthFunc = GL_LESS;
+
+	OpenGL::disableDepth();
+	OpenGL::setDepthMask(true);
+	OpenGL::setDepthFunc(OpenGL::DepthFunc::Less);
+}
+
+void GLStateManager::resetScissor() {
+	scissorEnabled = false;
+	OpenGL::disableScissor();
+	OpenGL::setScissor(0, 0, 0, 0);
+}
+
+void GLStateManager::resetVAO() {
+	boundVAO = 0;
+	glBindVertexArray(0);
+}
+
+void GLStateManager::resetVBO() {
+	boundVBO = 0;
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+void GLStateManager::resetProgram() {
+	currentProgram = 0;
+	glUseProgram(0);
+}
+
+void GLStateManager::reset() {
+	resetBlend();
+	resetColourMask();
+	resetDepth();
+
+	resetVAO();
+	resetVBO();
+	resetProgram();
+	resetScissor();
+}