diff options
author | bonmas14 <bonmas14@gmail.com> | 2025-09-20 22:28:15 +0300 |
---|---|---|
committer | bonmas14 <bonmas14@gmail.com> | 2025-09-20 22:28:15 +0300 |
commit | cdda4c4182c9ee068567529715e4a5c68a8efb58 (patch) | |
tree | 38a63f62a64018a2d35fc33354f8589fd33b7514 /deps/raylib/examples/shaders/shaders_deferred_render.c | |
download | c_wizard-cdda4c4182c9ee068567529715e4a5c68a8efb58.tar.gz c_wizard-cdda4c4182c9ee068567529715e4a5c68a8efb58.zip |
Init commit v1.0
Diffstat (limited to 'deps/raylib/examples/shaders/shaders_deferred_render.c')
-rw-r--r-- | deps/raylib/examples/shaders/shaders_deferred_render.c | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/deps/raylib/examples/shaders/shaders_deferred_render.c b/deps/raylib/examples/shaders/shaders_deferred_render.c new file mode 100644 index 0000000..4f652fe --- /dev/null +++ b/deps/raylib/examples/shaders/shaders_deferred_render.c @@ -0,0 +1,339 @@ +/******************************************************************************************* +* +* raylib [shaders] example - deferred rendering +* +* NOTE: This example requires raylib OpenGL 3.3 or OpenGL ES 3.0 +* +* Example originally created with raylib 4.5, last time updated with raylib 4.5 +* +* Example contributed by Justin Andreas Lacoste (@27justin) and reviewed by Ramon Santamaria (@raysan5) +* +* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified, +* BSD-like license that allows static linking with closed source software +* +* Copyright (c) 2023 Justin Andreas Lacoste (@27justin) +* +********************************************************************************************/ + +#include "raylib.h" + +#include "rlgl.h" +#include "raymath.h" + +#define RLIGHTS_IMPLEMENTATION +#include "rlights.h" + +#if defined(PLATFORM_DESKTOP) + #define GLSL_VERSION 330 +#else // PLATFORM_ANDROID, PLATFORM_WEB + #define GLSL_VERSION 100 +#endif + +#include <stdlib.h> // Required for: NULL + +#define MAX_CUBES 30 + +// GBuffer data +typedef struct GBuffer { + unsigned int framebuffer; + + unsigned int positionTexture; + unsigned int normalTexture; + unsigned int albedoSpecTexture; + + unsigned int depthRenderbuffer; +} GBuffer; + +// Deferred mode passes +typedef enum { + DEFERRED_POSITION, + DEFERRED_NORMAL, + DEFERRED_ALBEDO, + DEFERRED_SHADING +} DeferredMode; + +//------------------------------------------------------------------------------------ +// Program main entry point +//------------------------------------------------------------------------------------ +int main(void) +{ + // Initialization + // ------------------------------------------------------------------------------------- + const int screenWidth = 800; + const int screenHeight = 450; + + InitWindow(screenWidth, screenHeight, "raylib [shaders] example - deferred render"); + + Camera camera = { 0 }; + camera.position = (Vector3){ 5.0f, 4.0f, 5.0f }; // Camera position + camera.target = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera looking at point + camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target) + camera.fovy = 60.0f; // Camera field-of-view Y + camera.projection = CAMERA_PERSPECTIVE; // Camera projection type + + // Load plane model from a generated mesh + Model model = LoadModelFromMesh(GenMeshPlane(10.0f, 10.0f, 3, 3)); + Model cube = LoadModelFromMesh(GenMeshCube(2.0f, 2.0f, 2.0f)); + + // Load geometry buffer (G-buffer) shader and deferred shader + Shader gbufferShader = LoadShader("resources/shaders/glsl330/gbuffer.vs", + "resources/shaders/glsl330/gbuffer.fs"); + + Shader deferredShader = LoadShader("resources/shaders/glsl330/deferred_shading.vs", + "resources/shaders/glsl330/deferred_shading.fs"); + deferredShader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(deferredShader, "viewPosition"); + + // Initialize the G-buffer + GBuffer gBuffer = { 0 }; + gBuffer.framebuffer = rlLoadFramebuffer(); + + if (!gBuffer.framebuffer) + { + TraceLog(LOG_WARNING, "Failed to create framebuffer"); + exit(1); + } + + rlEnableFramebuffer(gBuffer.framebuffer); + + // Since we are storing position and normal data in these textures, + // we need to use a floating point format. + gBuffer.positionTexture = rlLoadTexture(NULL, screenWidth, screenHeight, RL_PIXELFORMAT_UNCOMPRESSED_R32G32B32, 1); + + gBuffer.normalTexture = rlLoadTexture(NULL, screenWidth, screenHeight, RL_PIXELFORMAT_UNCOMPRESSED_R32G32B32, 1); + // Albedo (diffuse color) and specular strength can be combined into one texture. + // The color in RGB, and the specular strength in the alpha channel. + gBuffer.albedoSpecTexture = rlLoadTexture(NULL, screenWidth, screenHeight, RL_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, 1); + + // Activate the draw buffers for our framebuffer + rlActiveDrawBuffers(3); + + // Now we attach our textures to the framebuffer. + rlFramebufferAttach(gBuffer.framebuffer, gBuffer.positionTexture, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_TEXTURE2D, 0); + rlFramebufferAttach(gBuffer.framebuffer, gBuffer.normalTexture, RL_ATTACHMENT_COLOR_CHANNEL1, RL_ATTACHMENT_TEXTURE2D, 0); + rlFramebufferAttach(gBuffer.framebuffer, gBuffer.albedoSpecTexture, RL_ATTACHMENT_COLOR_CHANNEL2, RL_ATTACHMENT_TEXTURE2D, 0); + + // Finally we attach the depth buffer. + gBuffer.depthRenderbuffer = rlLoadTextureDepth(screenWidth, screenHeight, true); + rlFramebufferAttach(gBuffer.framebuffer, gBuffer.depthRenderbuffer, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0); + + // Make sure our framebuffer is complete. + // NOTE: rlFramebufferComplete() automatically unbinds the framebuffer, so we don't have + // to rlDisableFramebuffer() here. + if (!rlFramebufferComplete(gBuffer.framebuffer)) + { + TraceLog(LOG_WARNING, "Framebuffer is not complete"); + exit(1); + } + + // Now we initialize the sampler2D uniform's in the deferred shader. + // We do this by setting the uniform's value to the color channel slot we earlier + // bound our textures to. + rlEnableShader(deferredShader.id); + + rlSetUniformSampler(rlGetLocationUniform(deferredShader.id, "gPosition"), 0); + rlSetUniformSampler(rlGetLocationUniform(deferredShader.id, "gNormal"), 1); + rlSetUniformSampler(rlGetLocationUniform(deferredShader.id, "gAlbedoSpec"), 2); + + rlDisableShader(); + + // Assign out lighting shader to model + model.materials[0].shader = gbufferShader; + cube.materials[0].shader = gbufferShader; + + // Create lights + //-------------------------------------------------------------------------------------- + Light lights[MAX_LIGHTS] = { 0 }; + lights[0] = CreateLight(LIGHT_POINT, (Vector3){ -2, 1, -2 }, Vector3Zero(), YELLOW, deferredShader); + lights[1] = CreateLight(LIGHT_POINT, (Vector3){ 2, 1, 2 }, Vector3Zero(), RED, deferredShader); + lights[2] = CreateLight(LIGHT_POINT, (Vector3){ -2, 1, 2 }, Vector3Zero(), GREEN, deferredShader); + lights[3] = CreateLight(LIGHT_POINT, (Vector3){ 2, 1, -2 }, Vector3Zero(), BLUE, deferredShader); + + const float CUBE_SCALE = 0.25; + Vector3 cubePositions[MAX_CUBES] = { 0 }; + float cubeRotations[MAX_CUBES] = { 0 }; + + for (int i = 0; i < MAX_CUBES; i++) + { + cubePositions[i] = (Vector3){ + .x = (float)(rand()%10) - 5, + .y = (float)(rand()%5), + .z = (float)(rand()%10) - 5, + }; + + cubeRotations[i] = (float)(rand()%360); + } + + DeferredMode mode = DEFERRED_SHADING; + + rlEnableDepthTest(); + + SetTargetFPS(60); // Set our game to run at 60 frames-per-second + //--------------------------------------------------------------------------------------- + + // Main game loop + while (!WindowShouldClose()) + { + // Update + //---------------------------------------------------------------------------------- + UpdateCamera(&camera, CAMERA_ORBITAL); + + // Update the shader with the camera view vector (points towards { 0.0f, 0.0f, 0.0f }) + float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z }; + SetShaderValue(deferredShader, deferredShader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3); + + // Check key inputs to enable/disable lights + if (IsKeyPressed(KEY_Y)) { lights[0].enabled = !lights[0].enabled; } + if (IsKeyPressed(KEY_R)) { lights[1].enabled = !lights[1].enabled; } + if (IsKeyPressed(KEY_G)) { lights[2].enabled = !lights[2].enabled; } + if (IsKeyPressed(KEY_B)) { lights[3].enabled = !lights[3].enabled; } + + // Check key inputs to switch between G-buffer textures + if (IsKeyPressed(KEY_ONE)) mode = DEFERRED_POSITION; + if (IsKeyPressed(KEY_TWO)) mode = DEFERRED_NORMAL; + if (IsKeyPressed(KEY_THREE)) mode = DEFERRED_ALBEDO; + if (IsKeyPressed(KEY_FOUR)) mode = DEFERRED_SHADING; + + // Update light values (actually, only enable/disable them) + for (int i = 0; i < MAX_LIGHTS; i++) UpdateLightValues(deferredShader, lights[i]); + //---------------------------------------------------------------------------------- + + // Draw + // --------------------------------------------------------------------------------- + BeginDrawing(); + + ClearBackground(RAYWHITE); + + // Draw to the geometry buffer by first activating it + rlEnableFramebuffer(gBuffer.framebuffer); + rlClearScreenBuffers(); // Clear color and depth buffer + + rlDisableColorBlend(); + BeginMode3D(camera); + // NOTE: We have to use rlEnableShader here. `BeginShaderMode` or thus `rlSetShader` + // will not work, as they won't immediately load the shader program. + rlEnableShader(gbufferShader.id); + // When drawing a model here, make sure that the material's shaders + // are set to the gbuffer shader! + DrawModel(model, Vector3Zero(), 1.0f, WHITE); + DrawModel(cube, (Vector3) { 0.0, 1.0f, 0.0 }, 1.0f, WHITE); + + for (int i = 0; i < MAX_CUBES; i++) + { + Vector3 position = cubePositions[i]; + DrawModelEx(cube, position, (Vector3) { 1, 1, 1 }, cubeRotations[i], (Vector3) { CUBE_SCALE, CUBE_SCALE, CUBE_SCALE }, WHITE); + } + + rlDisableShader(); + EndMode3D(); + rlEnableColorBlend(); + + // Go back to the default framebuffer (0) and draw our deferred shading. + rlDisableFramebuffer(); + rlClearScreenBuffers(); // Clear color & depth buffer + + switch (mode) + { + case DEFERRED_SHADING: + { + BeginMode3D(camera); + rlDisableColorBlend(); + rlEnableShader(deferredShader.id); + // Activate our g-buffer textures + // These will now be bound to the sampler2D uniforms `gPosition`, `gNormal`, + // and `gAlbedoSpec` + rlActiveTextureSlot(0); + rlEnableTexture(gBuffer.positionTexture); + rlActiveTextureSlot(1); + rlEnableTexture(gBuffer.normalTexture); + rlActiveTextureSlot(2); + rlEnableTexture(gBuffer.albedoSpecTexture); + + // Finally, we draw a fullscreen quad to our default framebuffer + // This will now be shaded using our deferred shader + rlLoadDrawQuad(); + rlDisableShader(); + rlEnableColorBlend(); + EndMode3D(); + + // As a last step, we now copy over the depth buffer from our g-buffer to the default framebuffer. + rlBindFramebuffer(RL_READ_FRAMEBUFFER, gBuffer.framebuffer); + rlBindFramebuffer(RL_DRAW_FRAMEBUFFER, 0); + rlBlitFramebuffer(0, 0, screenWidth, screenHeight, 0, 0, screenWidth, screenHeight, 0x00000100); // GL_DEPTH_BUFFER_BIT + rlDisableFramebuffer(); + + // Since our shader is now done and disabled, we can draw our lights in default + // forward rendering + BeginMode3D(camera); + rlEnableShader(rlGetShaderIdDefault()); + for(int i = 0; i < MAX_LIGHTS; i++) + { + if (lights[i].enabled) DrawSphereEx(lights[i].position, 0.2f, 8, 8, lights[i].color); + else DrawSphereWires(lights[i].position, 0.2f, 8, 8, ColorAlpha(lights[i].color, 0.3f)); + } + rlDisableShader(); + EndMode3D(); + + DrawText("FINAL RESULT", 10, screenHeight - 30, 20, DARKGREEN); + } break; + case DEFERRED_POSITION: + { + DrawTextureRec((Texture2D){ + .id = gBuffer.positionTexture, + .width = screenWidth, + .height = screenHeight, + }, (Rectangle) { 0, 0, (float)screenWidth, (float)-screenHeight }, Vector2Zero(), RAYWHITE); + + DrawText("POSITION TEXTURE", 10, screenHeight - 30, 20, DARKGREEN); + } break; + case DEFERRED_NORMAL: + { + DrawTextureRec((Texture2D){ + .id = gBuffer.normalTexture, + .width = screenWidth, + .height = screenHeight, + }, (Rectangle) { 0, 0, (float)screenWidth, (float)-screenHeight }, Vector2Zero(), RAYWHITE); + + DrawText("NORMAL TEXTURE", 10, screenHeight - 30, 20, DARKGREEN); + } break; + case DEFERRED_ALBEDO: + { + DrawTextureRec((Texture2D){ + .id = gBuffer.albedoSpecTexture, + .width = screenWidth, + .height = screenHeight, + }, (Rectangle) { 0, 0, (float)screenWidth, (float)-screenHeight }, Vector2Zero(), RAYWHITE); + + DrawText("ALBEDO TEXTURE", 10, screenHeight - 30, 20, DARKGREEN); + } break; + default: break; + } + + DrawText("Toggle lights keys: [Y][R][G][B]", 10, 40, 20, DARKGRAY); + DrawText("Switch G-buffer textures: [1][2][3][4]", 10, 70, 20, DARKGRAY); + + DrawFPS(10, 10); + + EndDrawing(); + // ----------------------------------------------------------------------------- + } + + // De-Initialization + //-------------------------------------------------------------------------------------- + UnloadModel(model); // Unload the models + UnloadModel(cube); + + UnloadShader(deferredShader); // Unload shaders + UnloadShader(gbufferShader); + + // Unload geometry buffer and all attached textures + rlUnloadFramebuffer(gBuffer.framebuffer); + rlUnloadTexture(gBuffer.positionTexture); + rlUnloadTexture(gBuffer.normalTexture); + rlUnloadTexture(gBuffer.albedoSpecTexture); + rlUnloadTexture(gBuffer.depthRenderbuffer); + + CloseWindow(); // Close window and OpenGL context + //-------------------------------------------------------------------------------------- + + return 0; +} |