From 9075f934aae2cccad18ba96130650965875f2fa1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Foucault?= <foucault.clem@gmail.com>
Date: Tue, 9 May 2017 21:57:13 +0200
Subject: Eevee: Initial Depth Of Field commit.

---
 .../engines/eevee/shaders/effect_dof_vert.glsl     | 92 ++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 source/blender/draw/engines/eevee/shaders/effect_dof_vert.glsl

(limited to 'source/blender/draw/engines/eevee/shaders/effect_dof_vert.glsl')

diff --git a/source/blender/draw/engines/eevee/shaders/effect_dof_vert.glsl b/source/blender/draw/engines/eevee/shaders/effect_dof_vert.glsl
new file mode 100644
index 00000000000..3899365a771
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/effect_dof_vert.glsl
@@ -0,0 +1,92 @@
+
+in vec2 pos;
+in vec2 uvs;
+
+uniform vec2 layerSelection;
+
+uniform sampler2D colorBuffer;
+uniform sampler2D cocBuffer;
+
+flat out vec4 color;
+out vec2 particlecoord;
+
+#define M_PI 3.1415926535897932384626433832795
+
+/* geometry shading pass, calculate a texture coordinate based on the indexed id */
+void step_scatter()
+{
+	ivec2 tex_size = textureSize(cocBuffer, 0);
+	vec2 texel_size = 1.0 / vec2(tex_size);
+
+	int t_id = gl_VertexID / 3; /* Triangle Id */
+
+	ivec2 texelco = ivec2(0);
+	/* some math to get the target pixel */
+	texelco.x = t_id % tex_size.x;
+	texelco.y = t_id / tex_size.x;
+
+	float coc = dot(layerSelection, texelFetch(cocBuffer, texelco, 0).rg);
+
+	/* Clamp to max size for performance */
+	coc = min(coc, 100.0);
+
+	if (coc >= 1.0) {
+		color = texelFetch(colorBuffer, texelco, 0);
+		/* find the area the pixel will cover and divide the color by it */
+		float alpha = 1.0 / (coc * coc * M_PI);
+		color *= alpha;
+		color.a = alpha;
+	}
+	else {
+		color = vec4(0.0);
+	}
+
+	/* Generate Triangle : less memory fetches from a VBO */
+	int v_id = gl_VertexID % 3; /* Vertex Id */
+
+	/* Extend to cover at least the unit circle */
+	const float extend = (cos(M_PI / 4.0) + 1.0) * 2.0;
+	/* Crappy diagram
+	 * ex 1
+	 *    | \
+	 *    |   \
+	 *  1 |     \
+	 *    |       \
+	 *    |         \
+	 *  0 |     x     \
+	 *    |   Circle    \
+	 *    |   Origin      \
+	 * -1 0 --------------- 2
+	 *   -1     0     1     ex
+	 **/
+	gl_Position.x = float(v_id / 2) * extend - 1.0; /* int divisor round down */
+	gl_Position.y = float(v_id % 2) * extend - 1.0;
+	gl_Position.z = 0.0;
+	gl_Position.w = 1.0;
+
+	/* Generate Triangle */
+	particlecoord = gl_Position.xy;
+
+	gl_Position.xy *= coc * texel_size;
+	gl_Position.xy -= 1.0 - 0.5 * texel_size; /* NDC Bottom left */
+	gl_Position.xy += (0.5 + vec2(texelco) * 2.0) * texel_size;
+}
+
+out vec2 uvcoord;
+
+void passthrough()
+{
+	uvcoord = uvs;
+	gl_Position = vec4(pos, 0.0, 1.0);
+}
+
+void main()
+{
+#if defined(STEP_DOWNSAMPLE)
+	passthrough();
+#elif defined(STEP_SCATTER)
+	step_scatter();
+#elif defined(STEP_RESOLVE)
+	passthrough();
+#endif
+}
\ No newline at end of file
-- 
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