UnrealXR/raylib
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Review BeginTextureMode() usage

Browse source 
Moved outside BeginDrawing()/EndDrawing() to illustrate drawing is happening to an external texture (not screen)
This commit is contained in:
Ray 2021-06-23 01:25:09 +02:00
parent f989048bda
commit 716e26aa37
8 changed files with 113 additions and 143 deletions
Download patch file Download diff file Expand all files Collapse all files

34
examples/shaders/shaders_eratosthenes.c
View file

@ -46,11 +46,11 @@ int main(void)
// NOTE: Defining 0 (NULL) for vertex shader forces usage of internal default vertex shader
Shader shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/eratosthenes.fs", GLSL_VERSION));
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
@ -59,35 +59,33 @@ int main(void)
// Draw
//----------------------------------------------------------------------------------
BeginTextureMode(target); // Enable drawing to texture
ClearBackground(BLACK); // Clear the render texture
// Draw a rectangle in shader mode to be used as shader canvas
// NOTE: Rectangle uses font white character texture coordinates,
// so shader can not be applied here directly because input vertexTexCoord
// do not represent full screen coordinates (space where want to apply shader)
DrawRectangle(0, 0, GetScreenWidth(), GetScreenHeight(), BLACK);
EndTextureMode(); // End drawing to texture (now we have a blank texture available for the shader)
BeginDrawing();
ClearBackground(RAYWHITE);
BeginTextureMode(target); // Enable drawing to texture
ClearBackground(BLACK); // Clear the render texture
// Draw a rectangle in shader mode to be used as shader canvas
// NOTE: Rectangle uses font white character texture coordinates,
// so shader can not be applied here directly because input vertexTexCoord
// do not represent full screen coordinates (space where want to apply shader)
DrawRectangle(0, 0, GetScreenWidth(), GetScreenHeight(), BLACK);
EndTextureMode(); // End drawing to texture (now we have a blank texture available for the shader)
ClearBackground(RAYWHITE); // Clear screen background
BeginShaderMode(shader);
// NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
DrawTextureRec(target.texture, (Rectangle){ 0, 0, (float)target.texture.width, (float)-target.texture.height }, (Vector2){ 0.0f, 0.0f }, WHITE);
EndShaderMode();
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadShader(shader); // Unload shader
UnloadRenderTexture(target); // Unload texture
UnloadShader(shader); // Unload shader
UnloadRenderTexture(target); // Unload render texture
CloseWindow(); // Close window and OpenGL context
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;