aboutsummaryrefslogtreecommitdiff
path: root/deps/raylib/examples/shaders/shaders_palette_switch.c
diff options
context:
space:
mode:
Diffstat (limited to 'deps/raylib/examples/shaders/shaders_palette_switch.c')
-rw-r--r--deps/raylib/examples/shaders/shaders_palette_switch.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/deps/raylib/examples/shaders/shaders_palette_switch.c b/deps/raylib/examples/shaders/shaders_palette_switch.c
new file mode 100644
index 0000000..797fac8
--- /dev/null
+++ b/deps/raylib/examples/shaders/shaders_palette_switch.c
@@ -0,0 +1,152 @@
+/*******************************************************************************************
+*
+* raylib [shaders] example - Color palette switch
+*
+* NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
+* OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
+*
+* NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example
+* on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders
+* raylib comes with shaders ready for both versions, check raylib/shaders install folder
+*
+* Example originally created with raylib 2.5, last time updated with raylib 3.7
+*
+* Example contributed by Marco Lizza (@MarcoLizza) 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) 2019-2024 Marco Lizza (@MarcoLizza) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#if defined(PLATFORM_DESKTOP)
+ #define GLSL_VERSION 330
+#else // PLATFORM_ANDROID, PLATFORM_WEB
+ #define GLSL_VERSION 100
+#endif
+
+#define MAX_PALETTES 3
+#define COLORS_PER_PALETTE 8
+#define VALUES_PER_COLOR 3
+
+static const int palettes[MAX_PALETTES][COLORS_PER_PALETTE*VALUES_PER_COLOR] = {
+ { // 3-BIT RGB
+ 0, 0, 0,
+ 255, 0, 0,
+ 0, 255, 0,
+ 0, 0, 255,
+ 0, 255, 255,
+ 255, 0, 255,
+ 255, 255, 0,
+ 255, 255, 255,
+ },
+ { // AMMO-8 (GameBoy-like)
+ 4, 12, 6,
+ 17, 35, 24,
+ 30, 58, 41,
+ 48, 93, 66,
+ 77, 128, 97,
+ 137, 162, 87,
+ 190, 220, 127,
+ 238, 255, 204,
+ },
+ { // RKBV (2-strip film)
+ 21, 25, 26,
+ 138, 76, 88,
+ 217, 98, 117,
+ 230, 184, 193,
+ 69, 107, 115,
+ 75, 151, 166,
+ 165, 189, 194,
+ 255, 245, 247,
+ }
+};
+
+static const char *paletteText[] = {
+ "3-BIT RGB",
+ "AMMO-8 (GameBoy-like)",
+ "RKBV (2-strip film)"
+};
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+ // Initialization
+ //--------------------------------------------------------------------------------------
+ const int screenWidth = 800;
+ const int screenHeight = 450;
+
+ InitWindow(screenWidth, screenHeight, "raylib [shaders] example - color palette switch");
+
+ // Load shader to be used on some parts drawing
+ // NOTE 1: Using GLSL 330 shader version, on OpenGL ES 2.0 use GLSL 100 shader version
+ // NOTE 2: Defining 0 (NULL) for vertex shader forces usage of internal default vertex shader
+ Shader shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/palette_switch.fs", GLSL_VERSION));
+
+ // Get variable (uniform) location on the shader to connect with the program
+ // NOTE: If uniform variable could not be found in the shader, function returns -1
+ int paletteLoc = GetShaderLocation(shader, "palette");
+
+ int currentPalette = 0;
+ int lineHeight = screenHeight/COLORS_PER_PALETTE;
+
+ SetTargetFPS(60); // Set our game to run at 60 frames-per-second
+ //--------------------------------------------------------------------------------------
+
+ // Main game loop
+ while (!WindowShouldClose()) // Detect window close button or ESC key
+ {
+ // Update
+ //----------------------------------------------------------------------------------
+ if (IsKeyPressed(KEY_RIGHT)) currentPalette++;
+ else if (IsKeyPressed(KEY_LEFT)) currentPalette--;
+
+ if (currentPalette >= MAX_PALETTES) currentPalette = 0;
+ else if (currentPalette < 0) currentPalette = MAX_PALETTES - 1;
+
+ // Send palette data to the shader to be used on drawing
+ // NOTE: We are sending RGB triplets w/o the alpha channel
+ SetShaderValueV(shader, paletteLoc, palettes[currentPalette], SHADER_UNIFORM_IVEC3, COLORS_PER_PALETTE);
+ //----------------------------------------------------------------------------------
+
+ // Draw
+ //----------------------------------------------------------------------------------
+ BeginDrawing();
+
+ ClearBackground(RAYWHITE);
+
+ BeginShaderMode(shader);
+
+ for (int i = 0; i < COLORS_PER_PALETTE; i++)
+ {
+ // Draw horizontal screen-wide rectangles with increasing "palette index"
+ // The used palette index is encoded in the RGB components of the pixel
+ DrawRectangle(0, lineHeight*i, GetScreenWidth(), lineHeight, (Color){ i, i, i, 255 });
+ }
+
+ EndShaderMode();
+
+ DrawText("< >", 10, 10, 30, DARKBLUE);
+ DrawText("CURRENT PALETTE:", 60, 15, 20, RAYWHITE);
+ DrawText(paletteText[currentPalette], 300, 15, 20, RED);
+
+ DrawFPS(700, 15);
+
+ EndDrawing();
+ //----------------------------------------------------------------------------------
+ }
+
+ // De-Initialization
+ //--------------------------------------------------------------------------------------
+ UnloadShader(shader); // Unload shader
+
+ CloseWindow(); // Close window and OpenGL context
+ //--------------------------------------------------------------------------------------
+
+ return 0;
+}