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Diffstat (limited to 'deps/raylib/examples/models/models_point_rendering.c')
| -rw-r--r-- | deps/raylib/examples/models/models_point_rendering.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/deps/raylib/examples/models/models_point_rendering.c b/deps/raylib/examples/models/models_point_rendering.c new file mode 100644 index 0000000..68d4984 --- /dev/null +++ b/deps/raylib/examples/models/models_point_rendering.c @@ -0,0 +1,182 @@ +/******************************************************************************************* +* +* raylib example - point rendering +* +* Example originally created with raylib 5.0, last time updated with raylib 5.0 +* +* Example contributed by Reese Gallagher (@satchelfrost) 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) 2024 Reese Gallagher (@satchelfrost) +* +********************************************************************************************/ + +#include "raylib.h" + +#include <stdlib.h> // Required for: rand() +#include <math.h> // Required for: cos(), sin() + +#define MAX_POINTS 10000000 // 10 million +#define MIN_POINTS 1000 // 1 thousand + +// Generate mesh using points +Mesh GenMeshPoints(int numPoints); + +//------------------------------------------------------------------------------------ +// Program main entry point +//------------------------------------------------------------------------------------ +int main() +{ + // Initialization + //-------------------------------------------------------------------------------------- + const int screenWidth = 800; + const int screenHeight = 450; + + InitWindow(screenWidth, screenHeight, "raylib [models] example - point rendering"); + + Camera camera = { + .position = { 3.0f, 3.0f, 3.0f }, + .target = { 0.0f, 0.0f, 0.0f }, + .up = { 0.0f, 1.0f, 0.0f }, + .fovy = 45.0f, + .projection = CAMERA_PERSPECTIVE + }; + + Vector3 position = { 0.0f, 0.0f, 0.0f }; + bool useDrawModelPoints = true; + bool numPointsChanged = false; + int numPoints = 1000; + + Mesh mesh = GenMeshPoints(numPoints); + Model model = LoadModelFromMesh(mesh); + + //SetTargetFPS(60); + //-------------------------------------------------------------------------------------- + + // Main game loop + while(!WindowShouldClose()) + { + // Update + //---------------------------------------------------------------------------------- + UpdateCamera(&camera, CAMERA_ORBITAL); + + if (IsKeyPressed(KEY_SPACE)) useDrawModelPoints = !useDrawModelPoints; + if (IsKeyPressed(KEY_UP)) + { + numPoints = (numPoints*10 > MAX_POINTS)? MAX_POINTS : numPoints*10; + numPointsChanged = true; + } + if (IsKeyPressed(KEY_DOWN)) + { + numPoints = (numPoints/10 < MIN_POINTS)? MIN_POINTS : numPoints/10; + numPointsChanged = true; + } + + // Upload a different point cloud size + if (numPointsChanged) + { + UnloadModel(model); + mesh = GenMeshPoints(numPoints); + model = LoadModelFromMesh(mesh); + numPointsChanged = false; + } + //---------------------------------------------------------------------------------- + + // Draw + //---------------------------------------------------------------------------------- + BeginDrawing(); + ClearBackground(BLACK); + + BeginMode3D(camera); + + // The new method only uploads the points once to the GPU + if (useDrawModelPoints) + { + DrawModelPoints(model, position, 1.0f, WHITE); + } + else + { + // The old method must continually draw the "points" (lines) + for (int i = 0; i < numPoints; i++) + { + Vector3 pos = { + .x = mesh.vertices[i*3 + 0], + .y = mesh.vertices[i*3 + 1], + .z = mesh.vertices[i*3 + 2], + }; + Color color = { + .r = mesh.colors[i*4 + 0], + .g = mesh.colors[i*4 + 1], + .b = mesh.colors[i*4 + 2], + .a = mesh.colors[i*4 + 3], + }; + + DrawPoint3D(pos, color); + } + } + + // Draw a unit sphere for reference + DrawSphereWires(position, 1.0f, 10, 10, YELLOW); + + EndMode3D(); + + // Draw UI text + DrawText(TextFormat("Point Count: %d", numPoints), 20, screenHeight - 50, 40, WHITE); + DrawText("Up - increase points", 20, 70, 20, WHITE); + DrawText("Down - decrease points", 20, 100, 20, WHITE); + DrawText("Space - drawing function", 20, 130, 20, WHITE); + + if (useDrawModelPoints) DrawText("Using: DrawModelPoints()", 20, 160, 20, GREEN); + else DrawText("Using: DrawPoint3D()", 20, 160, 20, RED); + + DrawFPS(10, 10); + + EndDrawing(); + //---------------------------------------------------------------------------------- + } + + // De-Initialization + //-------------------------------------------------------------------------------------- + UnloadModel(model); + + CloseWindow(); + //-------------------------------------------------------------------------------------- + return 0; +} + +// Generate a spherical point cloud +Mesh GenMeshPoints(int numPoints) +{ + Mesh mesh = { + .triangleCount = 1, + .vertexCount = numPoints, + .vertices = (float *)MemAlloc(numPoints*3*sizeof(float)), + .colors = (unsigned char*)MemAlloc(numPoints*4*sizeof(unsigned char)), + }; + + // https://en.wikipedia.org/wiki/Spherical_coordinate_system + for (int i = 0; i < numPoints; i++) + { + float theta = PI*rand()/RAND_MAX; + float phi = 2.0f*PI*rand()/RAND_MAX; + float r = 10.0f*rand()/RAND_MAX; + + mesh.vertices[i*3 + 0] = r*sin(theta)*cos(phi); + mesh.vertices[i*3 + 1] = r*sin(theta)*sin(phi); + mesh.vertices[i*3 + 2] = r*cos(theta); + + Color color = ColorFromHSV(r*360.0f, 1.0f, 1.0f); + + mesh.colors[i*4 + 0] = color.r; + mesh.colors[i*4 + 1] = color.g; + mesh.colors[i*4 + 2] = color.b; + mesh.colors[i*4 + 3] = color.a; + } + + // Upload mesh data from CPU (RAM) to GPU (VRAM) memory + UploadMesh(&mesh, false); + + return mesh; +} |