initial commit

src/graphics/core/ShadowMap.cpp

@@ -0,0 +1,47 @@
+#include "ShadowMap.hpp"
+
+#include <GL/glew.h>
+
+ShadowMap::ShadowMap(int resolution) : resolution(resolution) {
+    glGenTextures(1, &depthMap);
+    glBindTexture(GL_TEXTURE_2D, depthMap);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
+        resolution, resolution, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
+    float border[4] {1.0f, 1.0f, 1.0f, 1.0f};
+    glTexParameterfv(GL_TEXTURE_2D,GL_TEXTURE_BORDER_COLOR, border);
+
+    glGenFramebuffers(1, &fbo);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);
+    glDrawBuffer(GL_NONE);
+    glReadBuffer(GL_NONE);
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+ShadowMap::~ShadowMap() {
+    glDeleteFramebuffers(1, &fbo);
+    glDeleteTextures(1, &depthMap);
+}
+
+void ShadowMap::bind() {
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+    glClear(GL_DEPTH_BUFFER_BIT);
+}
+
+void ShadowMap::unbind() {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+uint ShadowMap::getDepthMap() const {
+    return depthMap;
+}
+
+int ShadowMap::getResolution() const {
+    return resolution;
+}