Method

CoglFramebufferdraw_textured_rectangles

Declaration [src]

void
cogl_framebuffer_draw_textured_rectangles (
  CoglFramebuffer* framebuffer,
  CoglPipeline* pipeline,
  const float* coordinates,
  unsigned int n_rectangles
)

Description [src]

Draws a series of rectangles to framebuffer with the given pipeline state in the same way that cogl_framebuffer_draw_textured_rectangle() does.

The position is the position before the rectangle has been transformed by the model-view matrix and the projection matrix.

This is a high level drawing api that can handle any kind of CoglTexture texture such as CoglTexture2DSliced textures which may internally be comprised of multiple low-level textures. This is unlike low-level drawing apis such as cogl_primitive_draw() which only support low level texture types that are directly supported by GPUs such as CoglTexture2D.

The top left corner of the first rectangle is positioned at (coordinates[0], coordinates[1]) and the bottom right corner is positioned at (coordinates[2], coordinates[3]). The top left texture coordinate is (coordinates[4], coordinates[5]) and the bottom right texture coordinate is (coordinates[6], coordinates[7]). The coordinates for subsequent rectangles are defined similarly by the subsequent coordinates.

As a general rule for better performance its recommended to use this this API instead of calling cogl_framebuffer_draw_textured_rectangle() separately for multiple rectangles if all of the rectangles will be drawn together with the same pipeline state.

The given texture coordinates should always be normalized such that (0, 0) corresponds to the top left and (1, 1) corresponds to the bottom right. To map an entire texture across the rectangle pass in tex_coords[0]=0, tex_coords[1]=0, tex_coords[2]=1, tex_coords[3]=1.

Parameters

pipeline

Type: CoglPipeline

A CoglPipeline state object.

The data is owned by the caller of the method.

coordinates

Type: An array of float

An array containing groups of 8 float values: [x_1, y_1, x_2, y_2, s_1, t_1, s_2, t_2] that have the same meaning as the arguments for cogl_framebuffer_draw_textured_rectangle().

The data is owned by the caller of the method.

n_rectangles

Type: unsigned int

Number of rectangles to coordinates to draw.