source/blender/gpu/shaders/gpu_shader_2D_image_multi_rect_vert.glsl


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/**
 * Simple shader that just draw multiple icons at the specified locations
 * does not need any vertex input (producing less call to immBegin/End)
 */

/* Same as ICON_DRAW_CACHE_SIZE */
#define MAX_CALLS 16

uniform vec4 calls_data[MAX_CALLS * 3];

out vec2 texCoord_interp;
flat out vec4 finalColor;

void main()
{
	/* Rendering 2 triangle per icon. */
	int i = gl_VertexID / 6;
	int v = gl_VertexID % 6;

	vec4 pos = calls_data[i*3];
	vec4 tex = calls_data[i*3+1];
	finalColor = calls_data[i*3+2];

	/* TODO Remove this */
	if (v == 2) v = 4;
	else if (v == 3) v = 0;
	else if (v == 5) v = 2;

	if (v == 0) {
		pos.xy = pos.xw;
		tex.xy = tex.xw;
	}
	else if (v == 1) {
		pos.xy = pos.xz;
		tex.xy = tex.xz;
	}
	else if (v == 2) {
		pos.xy = pos.yw;
		tex.xy = tex.yw;
	}
	else {
		pos.xy = pos.yz;
		tex.xy = tex.yz;
	}

	gl_Position = vec4(pos.xy, 0.0f, 1.0f);
	texCoord_interp = tex.xy;
}