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Fog in ubershader

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This commit is contained in:
offtkp 2024-07-21 03:16:15 +03:00
parent a6e3d41628
commit 4176a19256
9 changed files with 110 additions and 20 deletions
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30
src/host_shaders/opengl_fragment_shader.frag
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@ -25,7 +25,7 @@ uniform bool u_depthmapEnable;
uniform sampler2D u_tex0;
uniform sampler2D u_tex1;
uniform sampler2D u_tex2;
uniform sampler2D u_tex_lighting_lut;
uniform sampler2D u_tex_luts;
uniform uint u_picaRegs[0x200 - 0x48];
@ -152,6 +152,8 @@ vec4 tevCalculateCombiner(int tev_id) {
#define RG_LUT 5u
#define RR_LUT 6u
#define FOG_INDEX 24
uint GPUREG_LIGHTi_CONFIG;
uint GPUREG_LIGHTING_CONFIG1;
uint GPUREG_LIGHTING_LUTINPUT_SELECT;
@ -161,7 +163,7 @@ bool error_unimpl = false;
vec4 unimpl_color = vec4(1.0, 0.0, 1.0, 1.0);
float lutLookup(uint lut, int index) {
return texelFetch(u_tex_lighting_lut, ivec2(index, int(lut)), 0).r;
return texelFetch(u_tex_luts, ivec2(index, int(lut)), 0).r;
}
vec3 regToColor(uint reg) {
@ -494,7 +496,7 @@ void main() {
if (tevUnimplementedSourceFlag) {
// fragColour = vec4(1.0, 0.0, 1.0, 1.0);
}
// fragColour.rg = texture(u_tex_lighting_lut,vec2(gl_FragCoord.x/200.,float(int(gl_FragCoord.y/2)%24))).rr;
// fragColour.rg = texture(u_tex_luts,vec2(gl_FragCoord.x/200.,float(int(gl_FragCoord.y/2)%24))).rr;
// Get original depth value by converting from [near, far] = [0, 1] to [-1, 1]
// We do this by converting to [0, 2] first and subtracting 1 to go to [-1, 1]
@ -507,6 +509,28 @@ void main() {
// Write final fragment depth
gl_FragDepth = depth;
bool enable_fog = (textureEnvUpdateBuffer & 7u) == 5u;
if (enable_fog) {
bool flip_depth = (textureEnvUpdateBuffer & (1u << 16)) != 0u;
float fog_index = flip_depth ? 1.0 - depth : depth;
fog_index *= 128.0;
float clamped_index = clamp(floor(fog_index), 0.0, 127.0);
float delta = fog_index - clamped_index;
vec2 value = texelFetch(u_tex_luts, ivec2(int(clamped_index), FOG_INDEX), 0).rg;
float fog_factor = clamp(value.r + value.g * delta, 0.0, 1.0);
uint GPUREG_FOG_COLOR = readPicaReg(0x00E1u);
// Annoyingly color is not encoded in the same way as light color
float r = (GPUREG_FOG_COLOR & 0xFFu) / 255.0;
float g = ((GPUREG_FOG_COLOR >> 8) & 0xFFu) / 255.0;
float b = ((GPUREG_FOG_COLOR >> 16) & 0xFFu) / 255.0;
vec3 fog_color = vec3(r, g, b);
fragColour.rgb = mix(fog_color, fragColour.rgb, fog_factor);
}
// Perform alpha test
uint alphaControl = readPicaReg(0x104u);
if ((alphaControl & 1u) != 0u) { // Check if alpha test is on