public static int Main()
{
// 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(null, string.Format("resources/shaders/glsl{0}/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
Utils.SetShaderValueV(shader, paletteLoc, palettes[currentPalette], 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, new 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);
}
