SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)

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

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.

Return Value

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

Version

This function is available since SDL 2.0.18.

Example

// Create three vertices to render

SDL_Vertex vertex_1 = {{10.5, 10.5}, {255, 0, 0, 255}, {1, 1}};
SDL_Vertex vertex_2 = {{20.5, 10.5}, {255, 0, 0, 255}, {1, 1}};
SDL_Vertex vertex_3 = {{10.5, 20.5}, {255, 0, 0, 255}, {1, 1}};

// Put them into array

SDL_Vertex vertices[] = {
    vertex_1,
    vertex_2,
    vertex_3
};

// Set renderer color

SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_RenderClear(renderer);

// Render red triangle

SDL_RenderGeometry(renderer, texture, vertices, NULL, 3, 0);

SDL_RenderPresent(renderer);

CategoryAPI


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