rayjs/examples/shaders/shaders_texture_drawing.c

86 lines
3.5 KiB
C

/*******************************************************************************************
*
* raylib [textures] example - Texture drawing
*
* NOTE: This example illustrates how to draw into a blank texture using a shader
*
* Example originally created with raylib 2.0, last time updated with raylib 3.7
*
* Example contributed by Michał Ciesielski 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 Michał Ciesielski 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
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - texture drawing");
Image imBlank = GenImageColor(1024, 1024, BLANK);
Texture2D texture = LoadTextureFromImage(imBlank); // Load blank texture to fill on shader
UnloadImage(imBlank);
// NOTE: Using GLSL 330 shader version, on OpenGL ES 2.0 use GLSL 100 shader version
Shader shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/cubes_panning.fs", GLSL_VERSION));
float time = 0.0f;
int timeLoc = GetShaderLocation(shader, "uTime");
SetShaderValue(shader, timeLoc, &time, SHADER_UNIFORM_FLOAT);
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
//----------------------------------------------------------------------------------
time = (float)GetTime();
SetShaderValue(shader, timeLoc, &time, SHADER_UNIFORM_FLOAT);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginShaderMode(shader); // Enable our custom shader for next shapes/textures drawings
DrawTexture(texture, 0, 0, WHITE); // Drawing BLANK texture, all magic happens on shader
EndShaderMode(); // Disable our custom shader, return to default shader
DrawText("BACKGROUND is PAINTED and ANIMATED on SHADER!", 10, 10, 20, MAROON);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadShader(shader);
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}