Rename/move particle shaders

1 files changed, 43 insertions, 0 deletions

diff --git a/source/blender/draw/modes/shaders/object_particle_prim_vert.glsl b/source/blender/draw/modes/shaders/object_particle_prim_vert.glsl
new file mode 100644
index 00000000000..2483ca5b2d2
--- /dev/null
+++ b/source/blender/draw/modes/shaders/object_particle_prim_vert.glsl
@@ -0,0 +1,43 @@
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 ViewProjectionMatrix;
+uniform mat4 ModelViewMatrix;
+uniform mat4 ProjectionMatrix;
+uniform int screen_space;
+uniform float pixel_size;
+uniform float draw_size;
+
+in vec3 pos;
+in vec4 rot;
+in vec3 inst_pos;
+in int axis;
+
+flat out int finalAxis;
+
+vec3 rotate(vec3 vec, vec4 quat)
+{
+	/* The quaternion representation here stores the w component in the first index */
+	return vec + 2.0 * cross(quat.yzw, cross(quat.yzw, vec) + quat.x * vec);
+}
+
+float mul_project_m4_v3_zfac(in vec3 co)
+{
+	return (ViewProjectionMatrix[0][3] * co.x) +
+	       (ViewProjectionMatrix[1][3] * co.y) +
+	       (ViewProjectionMatrix[2][3] * co.z) + ViewProjectionMatrix[3][3];
+}
+
+void main()
+{
+	float pix_size = mul_project_m4_v3_zfac(pos) * pixel_size;
+
+	if (screen_space == 1) {
+		gl_Position = ModelViewMatrix * vec4(pos, 1.0) + vec4(inst_pos * pix_size * draw_size, 0.0);
+		gl_Position = ProjectionMatrix * gl_Position;
+	}
+	else {
+		gl_Position = ModelViewProjectionMatrix * vec4(pos + rotate(inst_pos * pix_size * draw_size, rot), 1.0);
+	}
+
+	finalAxis = axis;
+}