You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
5.1 KiB
138 lines
5.1 KiB
/*******************************************************************************************
|
|
*
|
|
* raylib [textures] example - polygon drawing
|
|
*
|
|
* Example complexity rating: [★☆☆☆] 1/4
|
|
*
|
|
* Example originally created with raylib 3.7, last time updated with raylib 3.7
|
|
*
|
|
* Example contributed by Chris Camacho (@chriscamacho) 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) 2021-2025 Chris Camacho (@chriscamacho) and Ramon Santamaria (@raysan5)
|
|
*
|
|
********************************************************************************************/
|
|
|
|
#include "raylib.h"
|
|
|
|
#include "rlgl.h" // Required for: Vertex definition
|
|
#include "raymath.h"
|
|
|
|
#define MAX_POINTS 11 // 10 points and back to the start
|
|
|
|
// Draw textured polygon, defined by vertex and texture coordinates
|
|
void DrawTexturePoly(Texture2D texture, Vector2 center, Vector2 *points, Vector2 *texcoords, int pointCount, Color tint);
|
|
|
|
//------------------------------------------------------------------------------------
|
|
// Program main entry point
|
|
//------------------------------------------------------------------------------------
|
|
int main(void)
|
|
{
|
|
// Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
const int screenWidth = 800;
|
|
const int screenHeight = 450;
|
|
|
|
InitWindow(screenWidth, screenHeight, "raylib [textures] example - polygon drawing");
|
|
|
|
// Define texture coordinates to map our texture to poly
|
|
Vector2 texcoords[MAX_POINTS] = {
|
|
(Vector2){ 0.75f, 0.0f },
|
|
(Vector2){ 0.25f, 0.0f },
|
|
(Vector2){ 0.0f, 0.5f },
|
|
(Vector2){ 0.0f, 0.75f },
|
|
(Vector2){ 0.25f, 1.0f},
|
|
(Vector2){ 0.375f, 0.875f},
|
|
(Vector2){ 0.625f, 0.875f},
|
|
(Vector2){ 0.75f, 1.0f},
|
|
(Vector2){ 1.0f, 0.75f},
|
|
(Vector2){ 1.0f, 0.5f},
|
|
(Vector2){ 0.75f, 0.0f} // Close the poly
|
|
};
|
|
|
|
// Define the base poly vertices from the UV's
|
|
// NOTE: They can be specified in any other way
|
|
Vector2 points[MAX_POINTS] = { 0 };
|
|
for (int i = 0; i < MAX_POINTS; i++)
|
|
{
|
|
points[i].x = (texcoords[i].x - 0.5f)*256.0f;
|
|
points[i].y = (texcoords[i].y - 0.5f)*256.0f;
|
|
}
|
|
|
|
// Define the vertices drawing position
|
|
// NOTE: Initially same as points but updated every frame
|
|
Vector2 positions[MAX_POINTS] = { 0 };
|
|
for (int i = 0; i < MAX_POINTS; i++) positions[i] = points[i];
|
|
|
|
// Load texture to be mapped to poly
|
|
Texture texture = LoadTexture("resources/cat.png");
|
|
|
|
float angle = 0.0f; // Rotation angle (in degrees)
|
|
|
|
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
|
|
//----------------------------------------------------------------------------------
|
|
// Update points rotation with an angle transform
|
|
// NOTE: Base points position are not modified
|
|
angle++;
|
|
for (int i = 0; i < MAX_POINTS; i++) positions[i] = Vector2Rotate(points[i], angle*DEG2RAD);
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Draw
|
|
//----------------------------------------------------------------------------------
|
|
BeginDrawing();
|
|
|
|
ClearBackground(RAYWHITE);
|
|
|
|
DrawText("textured polygon", 20, 20, 20, DARKGRAY);
|
|
|
|
DrawTexturePoly(texture, (Vector2){ GetScreenWidth()/2.0f, GetScreenHeight()/2.0f },
|
|
positions, texcoords, MAX_POINTS, WHITE);
|
|
|
|
EndDrawing();
|
|
//----------------------------------------------------------------------------------
|
|
}
|
|
|
|
// De-Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
UnloadTexture(texture); // Unload texture
|
|
|
|
CloseWindow(); // Close window and OpenGL context
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Draw textured polygon, defined by vertex and texture coordinates
|
|
// NOTE: Polygon center must have straight line path to all points
|
|
// without crossing perimeter, points must be in anticlockwise order
|
|
void DrawTexturePoly(Texture2D texture, Vector2 center, Vector2 *points, Vector2 *texcoords, int pointCount, Color tint)
|
|
{
|
|
rlSetTexture(texture.id);
|
|
rlBegin(RL_TRIANGLES);
|
|
|
|
|
|
rlColor4ub(tint.r, tint.g, tint.b, tint.a);
|
|
|
|
for (int i = 0; i < pointCount - 1; i++)
|
|
{
|
|
rlTexCoord2f(0.5f, 0.5f);
|
|
rlVertex2f(center.x, center.y);
|
|
|
|
rlTexCoord2f(texcoords[i].x, texcoords[i].y);
|
|
rlVertex2f(points[i].x + center.x, points[i].y + center.y);
|
|
|
|
rlTexCoord2f(texcoords[i + 1].x, texcoords[i + 1].y);
|
|
rlVertex2f(points[i + 1].x + center.x, points[i + 1].y + center.y);
|
|
}
|
|
rlEnd();
|
|
|
|
rlSetTexture(0);
|
|
}
|