SDL Wiki

SDL_RenderGeometry

Render a list of triangles, optionally using a texture and indices into the vertex array Color and alpha modulation is done per vertex (SDL_SetTextureColorMod and SDL_SetTextureAlphaMod are ignored).

Syntax

int SDL_RenderGeometry(SDL_Renderer *renderer,
                       SDL_Texture *texture,
                       const SDL_Vertex *vertices, int num_vertices,
                       const int *indices, int num_indices);

Function Parameters

texture

(optional) The SDL texture to use.

vertices

Vertices.

num_vertices

Number of vertices.

indices

(optional) An array of integer indices into the 'vertices' array, if NULL all vertices will be rendered in sequential order.

num_indices

Number of indices.

Return Value

Return 0 on success, or -1 if the operation is not supported

Version

This function is available since SDL 2.0.18.

Code Examples

#include <SDL.h>

int main(int argc, char *argv[]) 
{
  SDL_bool quit = SDL_FALSE;
  SDL_Window *window = SDL_CreateWindow("Triangle Example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, 0);
  SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);

  SDL_Vertex vert[3];

  // center
  vert[0].position.x = 400;
  vert[0].position.y = 150;
  vert[0].color.r = 255;
  vert[0].color.g = 0;
  vert[0].color.b = 0;
  vert[0].color.a = 255;

  // left
  vert[1].position.x = 200;
  vert[1].position.y = 450;
  vert[1].color.r = 0;
  vert[1].color.g = 0;
  vert[1].color.b = 255;
  vert[1].color.a = 255;

  // right 
  vert[2].position.x = 600;
  vert[2].position.y = 450;
  vert[2].color.r = 0;
  vert[2].color.g = 255;
  vert[2].color.b = 0;
  vert[2].color.a = 255;
 
  while (!quit) {
   SDL_Event ev;
   while (SDL_PollEvent(&ev) != 0) {
      switch(ev.type) {
        case SDL_QUIT: 
        quit = SDL_TRUE;
        break;
      }
    }
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
    SDL_RenderClear(renderer);

    SDL_RenderGeometry(renderer, NULL, vert, 3, NULL, 0);

    SDL_RenderPresent(renderer);
  }
  
  SDL_DestroyRenderer(renderer);
  SDL_DestroyWindow(window);
  SDL_Quit();
  return 0;
}
SDL_RenderGeometryRaw
SDL_Vertex

CategoryAPI, CategoryRender


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