From 2bbf92ad5ae7708bf18ac7ef333e9a979d8d1bde Mon Sep 17 00:00:00 2001 From: Uneven Prankster Date: Thu, 16 Nov 2023 21:12:27 -0300 Subject: Working so hard like a soldier Can't afford a thing on TV --- raylib/examples/shaders/shaders_julia_set.c | 96 +++++++++++++++-------------- 1 file changed, 51 insertions(+), 45 deletions(-) (limited to 'raylib/examples/shaders/shaders_julia_set.c') diff --git a/raylib/examples/shaders/shaders_julia_set.c b/raylib/examples/shaders/shaders_julia_set.c index aebb287..608d3b5 100644 --- a/raylib/examples/shaders/shaders_julia_set.c +++ b/raylib/examples/shaders/shaders_julia_set.c @@ -9,12 +9,12 @@ * * Example originally created with raylib 2.5, last time updated with raylib 4.0 * -* Example contributed by eggmund (@eggmund) and reviewed by Ramon Santamaria (@raysan5) +* Example contributed by Josh Colclough (@joshcol9232) 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 eggmund (@eggmund) and Ramon Santamaria (@raysan5) +* Copyright (c) 2019-2023 Josh Colclough (@joshcol9232) and Ramon Santamaria (@raysan5) * ********************************************************************************************/ @@ -37,6 +37,13 @@ const float pointsOfInterest[6][2] = { -0.70176f, -0.3842f }, }; +const int screenWidth = 800; +const int screenHeight = 450; +const float zoomSpeed = 1.01f; +const float offsetSpeedMul = 2.0f; + +const float startingZoom = 0.75f; + //------------------------------------------------------------------------------------ // Program main entry point //------------------------------------------------------------------------------------ @@ -44,10 +51,6 @@ int main(void) { // Initialization //-------------------------------------------------------------------------------------- - const int screenWidth = 800; - const int screenHeight = 450; - - //SetConfigFlags(FLAG_WINDOW_HIGHDPI); InitWindow(screenWidth, screenHeight, "raylib [shaders] example - julia sets"); // Load julia set shader @@ -61,10 +64,8 @@ int main(void) float c[2] = { pointsOfInterest[0][0], pointsOfInterest[0][1] }; // Offset and zoom to draw the julia set at. (centered on screen and default size) - float offset[2] = { -(float)GetScreenWidth()/2, -(float)GetScreenHeight()/2 }; - float zoom = 1.0f; - - Vector2 offsetSpeed = { 0.0f, 0.0f }; + float offset[2] = { 0.0f, 0.0f }; + float zoom = startingZoom; // Get variable (uniform) locations on the shader to connect with the program // NOTE: If uniform variable could not be found in the shader, function returns -1 @@ -72,17 +73,13 @@ int main(void) int zoomLoc = GetShaderLocation(shader, "zoom"); int offsetLoc = GetShaderLocation(shader, "offset"); - // Tell the shader what the screen dimensions, zoom, offset and c are - float screenDims[2] = { (float)GetScreenWidth(), (float)GetScreenHeight() }; - SetShaderValue(shader, GetShaderLocation(shader, "screenDims"), screenDims, SHADER_UNIFORM_VEC2); - + // Upload the shader uniform values! SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2); SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT); SetShaderValue(shader, offsetLoc, offset, SHADER_UNIFORM_VEC2); int incrementSpeed = 0; // Multiplier of speed to change c value bool showControls = true; // Show controls - bool pause = false; // Pause animation SetTargetFPS(60); // Set our game to run at 60 frames-per-second //-------------------------------------------------------------------------------------- @@ -110,42 +107,50 @@ int main(void) SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2); } - if (IsKeyPressed(KEY_SPACE)) pause = !pause; // Pause animation (c change) - if (IsKeyPressed(KEY_F1)) showControls = !showControls; // Toggle whether or not to show controls - - if (!pause) + // If "R" is pressed, reset zoom and offset. + if (IsKeyPressed(KEY_R)) { - if (IsKeyPressed(KEY_RIGHT)) incrementSpeed++; - else if (IsKeyPressed(KEY_LEFT)) incrementSpeed--; - - // TODO: The idea is to zoom and move around with mouse - // Probably offset movement should be proportional to zoom level - if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) || IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) - { - if (IsMouseButtonDown(MOUSE_BUTTON_LEFT)) zoom += zoom*0.003f; - if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) zoom -= zoom*0.003f; - - Vector2 mousePos = GetMousePosition(); + zoom = startingZoom; + offset[0] = 0.0f; + offset[1] = 0.0f; + SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT); + SetShaderValue(shader, offsetLoc, offset, SHADER_UNIFORM_VEC2); + } - offsetSpeed.x = mousePos.x -(float)screenWidth/2; - offsetSpeed.y = mousePos.y -(float)screenHeight/2; + if (IsKeyPressed(KEY_SPACE)) incrementSpeed = 0; // Pause animation (c change) + if (IsKeyPressed(KEY_F1)) showControls = !showControls; // Toggle whether or not to show controls - // Slowly move camera to targetOffset - offset[0] += GetFrameTime()*offsetSpeed.x*0.8f; - offset[1] += GetFrameTime()*offsetSpeed.y*0.8f; - } - else offsetSpeed = (Vector2){ 0.0f, 0.0f }; + if (IsKeyPressed(KEY_RIGHT)) incrementSpeed++; + else if (IsKeyPressed(KEY_LEFT)) incrementSpeed--; + // If either left or right button is pressed, zoom in/out. + if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) || IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) + { + // Change zoom. If Mouse left -> zoom in. Mouse right -> zoom out. + zoom *= IsMouseButtonDown(MOUSE_BUTTON_LEFT)? zoomSpeed : 1.0f/zoomSpeed; + + const Vector2 mousePos = GetMousePosition(); + Vector2 offsetVelocity; + // Find the velocity at which to change the camera. Take the distance of the mouse + // from the center of the screen as the direction, and adjust magnitude based on + // the current zoom. + offsetVelocity.x = (mousePos.x/(float)screenWidth - 0.5f)*offsetSpeedMul/zoom; + offsetVelocity.y = (mousePos.y/(float)screenHeight - 0.5f)*offsetSpeedMul/zoom; + + // Apply move velocity to camera + offset[0] += GetFrameTime()*offsetVelocity.x; + offset[1] += GetFrameTime()*offsetVelocity.y; + + // Update the shader uniform values! SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT); SetShaderValue(shader, offsetLoc, offset, SHADER_UNIFORM_VEC2); - - // Increment c value with time - float amount = GetFrameTime()*incrementSpeed*0.0005f; - c[0] += amount; - c[1] += amount; - - SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2); } + + // Increment c value with time + const float dc = GetFrameTime()*(float)incrementSpeed*0.0005f; + c[0] += dc; + c[1] += dc; + SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2); //---------------------------------------------------------------------------------- // Draw @@ -178,7 +183,8 @@ int main(void) DrawText("Press KEY_F1 to toggle these controls", 10, 30, 10, RAYWHITE); DrawText("Press KEYS [1 - 6] to change point of interest", 10, 45, 10, RAYWHITE); DrawText("Press KEY_LEFT | KEY_RIGHT to change speed", 10, 60, 10, RAYWHITE); - DrawText("Press KEY_SPACE to pause movement animation", 10, 75, 10, RAYWHITE); + DrawText("Press KEY_SPACE to stop movement animation", 10, 75, 10, RAYWHITE); + DrawText("Press KEY_R to recenter the camera", 10, 90, 10, RAYWHITE); } EndDrawing(); //---------------------------------------------------------------------------------- -- cgit v1.2.3