some prb examples

1 files changed, 193 insertions, 0 deletions

diff --git a/pbr/2.1.1.ibl_irradiance_conversion/ibl_irradiance_conversion.c b/pbr/2.1.1.ibl_irradiance_conversion/ibl_irradiance_conversion.c
new file mode 100644
index 0000000..0ffbe7c
--- /dev/null
+++ b/pbr/2.1.1.ibl_irradiance_conversion/ibl_irradiance_conversion.c
@@ -0,0 +1,193 @@
+#include "GL/glew.h"
+#include "GLFW/glfw3.h"
+#include "common.h"
+
+int main(void)
+{
+	state_t state = init_state(1600, 800);
+
+	init_glfw(&state);
+	init_gl();
+	glDepthFunc(GL_LEQUAL);
+
+	/* meshes */
+	Mesh *cube = mesh_load_obj(state.arena, "../../data/models/cube.obj");
+	Mesh *quad = mesh_gen_quad(state.arena);
+
+	/* shaders */
+	add_shader("pbr.vert", "pbr.frag", 0);
+	add_shader("hdr.vert", "hdr.frag", 0);
+	add_shader("cubemap.vert", "cubemap.frag", 0);
+	add_shader("background.vert", "background.frag", 0);
+
+	light_t lights[4] = {
+		{{-10.0f, 0.0f, 20.0f}, {300.0f, 300.0f, 300.0f}},
+		{{-5.0f, 0.0f, 20.0f}, {300.0f, 300.0f, 300.0f}},
+		{{ 5.0f, 0.0f, 20.0f}, {300.0f, 300.0f, 300.0f}},
+		{{ 10.0f, 0.0f, 20.0f}, {300.0f, 300.0f, 300.0f}},
+	};
+
+	/* textures */
+	U32 hdr_texture = load_hdr_texture("../../data/textures/loigerwiesen.hdr");
+
+	/* framebuffers */
+	U32 hdr_fbo, hdr_colorbuffer, hdr_rbo;
+	glGenFramebuffers(1, &hdr_fbo);
+	glGenTextures(1, &hdr_colorbuffer);
+	glBindTexture(GL_TEXTURE_2D, hdr_colorbuffer);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, state.width, state.height, 0, GL_RGBA, GL_FLOAT, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glGenRenderbuffers(1, &hdr_rbo);
+	glBindRenderbuffer(GL_RENDERBUFFER, hdr_rbo);
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, state.width, state.height);
+	glBindFramebuffer(GL_FRAMEBUFFER, hdr_fbo);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, hdr_colorbuffer, 0);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, hdr_rbo);
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+		die("failed to create framebuffer");
+	glBindRenderbuffer(GL_RENDERBUFFER, 0);
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+	U32 capture_fbo, capture_rbo;
+	glGenFramebuffers(1, &capture_fbo);
+	glGenRenderbuffers(1, &capture_rbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, capture_fbo);
+	glBindRenderbuffer(GL_RENDERBUFFER, capture_rbo);
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, capture_rbo);
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+		die("failed to create framebuffer");
+	glBindRenderbuffer(GL_RENDERBUFFER, 0);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+	U32 cubemap;
+	glGenTextures(1, &cubemap);
+	glBindTexture(GL_TEXTURE_CUBE_MAP, cubemap);
+	for (U32 i = 0; i < 6; i++)
+		glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 512, 512, 0, GL_RGB, GL_FLOAT, 0);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	MAT4 capture_projection = perspective(90.0f, 1.0f, 0.1f, 10.0f);
+	V3F capture_origin = {0};
+	MAT4 capture_views[6] = {
+		look_at(capture_origin, v3f( 1.0f,  0.0f,  0.0f), v3f(0.0f, -1.0f,  0.0f)),
+		look_at(capture_origin, v3f(-1.0f,  0.0f,  0.0f), v3f(0.0f, -1.0f,  0.0f)),
+		look_at(capture_origin, v3f( 0.0f,  1.0f,  0.0f), v3f(0.0f,  0.0f,  1.0f)),
+		look_at(capture_origin, v3f( 0.0f, -1.0f,  0.0f), v3f(0.0f,  0.0f, -1.0f)),
+		look_at(capture_origin, v3f( 0.0f,  0.0f,  1.0f), v3f(0.0f, -1.0f,  0.0f)),
+		look_at(capture_origin, v3f( 0.0f,  0.0f, -1.0f), v3f(0.0f, -1.0f,  0.0f)),
+	};
+
+	glBindFramebuffer(GL_FRAMEBUFFER, capture_fbo);
+	U32 shader = find_shader("cubemap");
+	if (!shader) die("waht");
+	glUseProgram(shader);
+	shader_set_mat4fv(shader, "projection", capture_projection);
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, hdr_texture);
+
+	glViewport(0, 0, 512, 512);
+	for (U32 i = 0; i < 6; i++) {
+		shader_set_mat4fv(shader, "view", capture_views[i]);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, cubemap, 0);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		mesh_draw(cube);
+	}
+	glUseProgram(0);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+	glViewport(0, 0, state.width, state.height);
+
+	F32 time = 0;
+
+	while (!glfwWindowShouldClose(state.window)) {
+		handle_glfw_events(state.window, &state.input);
+		F32 dt = lock_framerate(60);
+		fps_info(dt, 10);
+
+		/* update */
+		update_camera_first_person(&state.camera, &state.input, dt, 2.0f);
+		F32 limit = 4.0f;
+		for (U32 i = 0; i < (sizeof(lights) / sizeof(lights[0])); i++)
+			lights[i].position.y = sinf(time + i) * limit;
+		time += dt;
+
+		/* render */
+		F32 ar = (F32)state.width / (F32)state.height;
+		MAT4 projection = camera_persp(state.camera, ar);
+		MAT4 view = get_view_matrix(&state.camera);
+
+		glClearColor(0.16f, 0.16f, 0.16f, 1.0f);
+
+		glBindFramebuffer(GL_FRAMEBUFFER, hdr_fbo);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+		shader = find_shader("pbr");
+		if (!shader) die("wha");
+		glUseProgram(shader);
+		shader_set_mat4fv(shader, "projection", projection);
+		shader_set_mat4fv(shader, "view", view);
+		shader_set_3fv(shader, "camera", state.camera.pos);
+		shader_set_3fv(shader, "color", v3f(0.04, 0.04, 0.04));
+		shader_set_1f(shader, "ao", 1.0f);
+		for (U32 i = 0; i < (sizeof(lights) / sizeof(lights[0])); i++) {
+			char str[512];
+			snprintf(str, 512, "lights[%d].position", i);
+			shader_set_3fv(shader, str, lights[i].position);
+			snprintf(str, 512, "lights[%d].color", i);
+			shader_set_3fv(shader, str, lights[i].color);
+		}
+		S32 rows = 7;
+		S32 cols = 7;
+		F32 offset = 3.0f;
+		for (S32 row = 0; row < rows; row++) {
+			shader_set_1f(shader, "metallic", (F32)row / (F32)rows);
+			for (S32 col = 0; col < cols; col++) {
+				shader_set_1f(shader, "roughness", clamp(0.05f, (F32)col / (F32)cols, 1.0f));
+				V3F pos = {(col - cols / 2.0f) * offset, (row - rows / 2.0f) * offset, 0.0f};
+				MAT4 model = mat4_make_translate(pos);
+				shader_set_mat4fv(shader, "model", model);
+				mesh_draw(cube);
+			}
+		}
+
+		for (U32 i = 0; i < (sizeof(lights) / sizeof(lights[0])); i++) {
+			MAT4 model = mat4_make_scale(v3f(0.5f, 0.5f, 0.5f));
+			model = mat4_translate(model, lights[i].position);
+			shader_set_mat4fv(shader, "model", model);
+			mesh_draw(cube);
+		}
+
+		glUseProgram(0);
+
+		shader = find_shader("background");
+		glUseProgram(shader);
+		shader_set_mat4fv(shader, "projection", projection);
+		shader_set_mat4fv(shader, "view", view);
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_CUBE_MAP, cubemap);
+		mesh_draw(cube);
+		glUseProgram(0);
+
+		glBindFramebuffer(GL_FRAMEBUFFER, 0);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+		shader = find_shader("hdr");
+		if (!shader) die("failed to find hdr shader!");
+		glUseProgram(shader);
+		glBindTexture(GL_TEXTURE_2D, hdr_colorbuffer);
+		shader_set_mat4fv(shader, "model", mat4_identity());
+		mesh_draw(quad);
+		glUseProgram(0);
+
+		glfwSwapBuffers(state.window);
+	}
+
+	return 0;
+}