new example: shaders_texture_drawing

examples/shaders/shaders_texture_drawing.c

@@ -0,0 +1,71 @@
+/*******************************************************************************************
+*
+*   raylib [textures] example - Shader texture drawing
+*
+*   This example illustrates how to draw on a blank texture using a shader
+*
+*   This example has been created using raylib 2.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2019 Michał Ciesielski and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - shader 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, "resources/shaders/glsl330/cubes_panning.fs");
+
+    float time = 0.0f;
+    int timeLoc = GetShaderLocation(shader, "uTime");
+    SetShaderValue(shader, timeLoc, &time, UNIFORM_FLOAT);
+
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    while (!WindowShouldClose())
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        time = GetTime();
+        SetShaderValue(shader, timeLoc, &time, 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;
+}