153 lines
5.6 KiB
C
153 lines
5.6 KiB
C
|
/*******************************************************************************************
|
||
|
*
|
||
|
* 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) 2019-2023 Marco Lizza (@MarcoLizza) and Ramon Santamaria (@raysan5)
|
||
|
*
|
||
|
********************************************************************************************/
|
||
|
|
||
|
#include "raylib.h"
|
||
|
|
||
|
#if defined(PLATFORM_DESKTOP)
|
||
|
#define GLSL_VERSION 330
|
||
|
#else // PLATFORM_RPI, 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 new value 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;
|
||
|
}
|