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).
Defined in <SDL3/SDL_render.h>
int SDL_RenderGeometry(SDL_Renderer *renderer,
SDL_Texture *texture,
const SDL_Vertex *vertices, int num_vertices,
const int *indices, int num_indices);
| renderer | The rendering context. |
| 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. |
Returns 0 on success, or -1 if the operation is not supported
This function is available since SDL 3.0.0.
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
int main(int argc, char *argv[])
{
SDL_bool quit = SDL_FALSE;
SDL_Window *window = SDL_CreateWindow("Triangle Example", 800, 600, 0);
SDL_Renderer *renderer = SDL_CreateRenderer(window, NULL);
#define vertLen 3
SDL_Vertex vert[vertLen];
// center
vert[0].position.x = 400;
vert[0].position.y = 150;
vert[0].color.r = 1.0;
vert[0].color.g = 0.0;
vert[0].color.b = 0.0;
vert[0].color.a = 1.0;
// left
vert[1].position.x = 200;
vert[1].position.y = 450;
vert[1].color.r = 0.0;
vert[1].color.g = 0.0;
vert[1].color.b = 1.0;
vert[1].color.a = 1.0;
// right
vert[2].position.x = 600;
vert[2].position.y = 450;
vert[2].color.r = 0.0;
vert[2].color.g = 1.0;
vert[2].color.b = 0.0;
vert[2].color.a = 1.0;
while (!quit) {
SDL_Event ev;
while (SDL_PollEvent(&ev) != 0) {
switch(ev.type) {
case SDL_EVENT_QUIT:
quit = SDL_TRUE;
break;
}
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
SDL_RenderGeometry(renderer, NULL, vert, vertLen, NULL, 0);
SDL_RenderPresent(renderer);
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}