Implement configurable lighting

main.c

@@ -7,13 +7,15 @@
 #include <stdio.h>
 #include <string.h>
 
-#define W 800
-#define H 600
+#define W 1280
+#define H 720
 
 #define DT (1'000'000 / 60) // Assume 60 Hz for now
 
 #define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))
 
+static light_params_t light_params;
+
 static void
 key_callback(GLFWwindow *window, int key, int scancode, int action, int mods)
 {
@@ -28,6 +30,17 @@ key_callback(GLFWwindow *window, int key, int scancode, int action, int mods)
 	case GLFW_KEY_Q:
 		glfwSetWindowShouldClose(window, GL_TRUE);
 		break;
+
+	case GLFW_KEY_UP:
+		light_params.cloudiness += 0.05;
+		if (light_params.cloudiness > 1)
+			light_params.cloudiness = 1;
+		break;
+	case GLFW_KEY_DOWN:
+		light_params.cloudiness -= 0.05;
+		if (light_params.cloudiness < 0)
+			light_params.cloudiness = 0;
+		break;
 	}
 }
 
@@ -57,16 +70,12 @@ int main(int argc, char *argv[])
 	gpu_model_load(&gpu, &model, gpu_models + 0);
 	gpu_model_load(&gpu, &model, gpu_models + 1);
 
-	const vec3_t cam = { 0, 4, -8 };
+	const vec3_t cam = { 2, 2, -8 };
 	const vec3_t tgt = { 0, 0, 0 };
 	const vec3_t up = { 0, 1, 0 };
-	const vec3_t light = { 2, 2, -1 };
 	const mat4_t view = mat4_lookat(cam, tgt, up);
-	const mat4_t proj = mat4_perspective((float)W / H, PI / 8, 0.1, 100.0);
+	const mat4_t proj = mat4_perspective((float)W / H, PI / 12, 0.1, 100.0);
 	const mat4_t vp = mat4_mul(proj, view);
-	const mat4_t light_view = mat4_lookat(light, tgt, up);
-	const mat4_t light_proj = mat4_orthographic(5, 5, 10);
-	const mat4_t light_vp = mat4_mul(light_proj, light_view);
 	mat4_t transforms[NELEMS(gpu_models)] = {
 		mat4_mul(
 		    MAT4_TRANSLATE(1, 0, 0),
@@ -92,6 +101,9 @@ int main(int argc, char *argv[])
 	animation_state_t anim = animation_init(&model);
 	animation_start(&anim, &model, 0);
 
+	light_params.sun_dir = vec3_norm((vec3_t) { 2, 4, -1 });
+	light_params.cloudiness = 0.0;
+
 	while (!glfwWindowShouldClose(window)) {
 		glfwPollEvents();
 
@@ -105,7 +117,7 @@ int main(int argc, char *argv[])
 			anim.bone_matrices,
 		};
 		gpu_render(
-		    &gpu, vp, light_vp, NELEMS(gpu_models), gpu_models,
+		    &gpu, vp, light_params, NELEMS(gpu_models), gpu_models,
 		    bone_matrices, transforms);
 	}