galaxy/geometry.glsl at master · mikoro/galaxy · GitHub

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#version 430 core

layout(points) in;
layout(triangle_strip, max_vertices = 4) out;

uniform mat4 projectionMatrix;

in vec4 vSize[];
in vec4 vColor[];

out vec2 gTexCoord;
out vec4 gColor;

void main(void)
{
	const vec4 position = gl_in[0].gl_Position;
	const float width = vSize[0].x;
	const float height = vSize[0].y;

	gColor = vColor[0];

	gl_Position = projectionMatrix * (position + vec4(-width, -height, 0, 0));
	gTexCoord = vec2(0, 0);
	EmitVertex();

	gl_Position = projectionMatrix * (position + vec4(-width, height, 0, 0));
	gTexCoord = vec2(0, 1);
	EmitVertex();

	gl_Position = projectionMatrix * (position + vec4(width, -height, 0, 0));
	gTexCoord = vec2(1, 0);
	EmitVertex();

	gl_Position = projectionMatrix * (position + vec4(width, height, 0, 0));
	gTexCoord = vec2(1, 1);
	EmitVertex();

	EndPrimitive();
}