Added scene related things

2022-04-23 22:46:06 +03:00
parent 3c721273c0
commit 50d032418e
27 changed files with 1177 additions and 16 deletions
@@ -0,0 +1,53 @@
+#include "light_node.h"
+
+//#define GL_COMPARE_REF_TO_TEXTURE 0x884E
+
+BEGIN_NAMESPACE
+
+light_node::light_node(light_type type_) {
+    type = scene_node_type::light;
+    light_type_ = type_;
+
+    shadow_map_bias_matrix = glm::scale(glm::translate(glm::mat4(1.0f), glm::vec3(0.5f, 0.5f, 0.5f)),
+                                        glm::vec3(0.5f, 0.5f, 0.5f));
+
+    int textures_to_generate = light_type_ == light_type::point ? 6 : 1;
+    for (int i = 0; i < textures_to_generate; i++) {
+        GLuint shadow_map_texture_id;
+
+        // setup the shadowmap texture
+        glGenTextures(1, &shadow_map_texture_id);
+        glBindTexture(GL_TEXTURE_2D, shadow_map_texture_id);
+
+        // set texture parameters
+        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_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
+        // TODO: see if we need
+//        glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_INTENSITY);
+
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
+                     shadow_map_width, shadow_map_width,
+                     0,
+                     GL_DEPTH_COMPONENT,
+                     GL_UNSIGNED_BYTE,
+                     nullptr);
+
+        shadow_map[i] = std::make_shared<texture>(shadow_map_texture_id, shadow_map_width, shadow_map_width);
+    }
+}
+
+void light_node::calculate_local_transform() {
+    if (light_type_ == light_type::spot) {
+        world_to_light_matrix[0] = glm::lookAt(position, spot_target, glm::vec3(0, 1, 0));
+        light_projection_matrix[0] = glm::perspective(90.0f, 1.0f, 0.1f, 100.0f);
+        glm::mat4 lightProjectionAndBiasMatrix = shadow_map_bias_matrix * light_projection_matrix[0];
+        final_shadow_map_matrix[0] = lightProjectionAndBiasMatrix * world_to_light_matrix[0];
+    }
+}
+
+END_NAMESPACE