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https://github.com/open-goal/jak-project.git
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79 lines
2.1 KiB
GLSL
79 lines
2.1 KiB
GLSL
#version 430 core
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layout (location = 0) in vec3 position_in;
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layout (location = 1) in vec3 tex_coord_in;
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layout (location = 2) in vec3 rgba_base;
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layout (location = 3) in int time_of_day_index;
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uniform vec4 hvdf_offset;
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uniform mat4 camera;
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uniform float fog_constant;
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uniform float fog_min;
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uniform float fog_max;
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layout (binding = 10) uniform sampler1D tex_T1; // note, sampled in the vertex shader on purpose.
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out vec4 fragment_color;
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out vec3 tex_coord;
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out float fogginess;
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const float SCISSOR_ADJUST = 512.0/448.0;
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void main() {
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// old system:
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// - load vf12
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// - itof0 vf12
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// - multiply with camera matrix (add trans)
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// - let Q = fogx / vf12.w
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// - xyz *= Q
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// - xyzw += hvdf_offset
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// - clip w.
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// - ftoi4 vf12
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// use in gs.
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// gs is 12.4 fixed point, set up with 2048.0 as the center.
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// the itof0 is done in the preprocessing step. now we have floats.
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// Step 3, the camera transform
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vec4 transformed = -camera[3];
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transformed -= camera[0] * position_in.x;
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transformed -= camera[1] * position_in.y;
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transformed -= camera[2] * position_in.z;
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// compute Q
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float Q = fog_constant / transformed.w;
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// do fog!
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fogginess = 255 - clamp(-transformed.w + hvdf_offset.w, fog_min, fog_max);
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// perspective divide!
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transformed.xyz *= Q;
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// offset
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transformed.xyz += hvdf_offset.xyz;
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// correct xy offset
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transformed.xy -= (2048.);
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// correct z scale
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transformed.z /= (8388608);
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transformed.z -= 1;
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// correct xy scale
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transformed.x /= (256);
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transformed.y /= -(128);
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// hack
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transformed.xyz *= transformed.w;
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// scissoring area adjust
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transformed.y *= SCISSOR_ADJUST;
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gl_Position = transformed;
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// time of day lookup
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// start with the vertex color (only rgb, VIF filled in the 255.)
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fragment_color = vec4(rgba_base, 1);
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// get the time of day multiplier
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vec4 tod_color = texelFetch(tex_T1, time_of_day_index, 0);
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// combine
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fragment_color *= tod_color * 4;
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fragment_color.a *= 2;
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tex_coord = tex_coord_in;
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}
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