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[GPU] cleanup and optimize the TEV shader functions

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This commit is contained in:
fleroviux 2023-06-17 01:27:26 +02:00
parent 76d6140797
commit c3acf2b393
1 changed files with 38 additions and 41 deletions

79
src/core/renderer_gl/renderer_gl.cpp
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@ -54,12 +54,13 @@ const char* fragmentShader = R"(
uniform sampler2D u_tex0;
// TODO: figure out what the correct "initial" value used by TEV0 is.
vec4 previous = vec4(1.0);
// TODO: figure out the color that is returned to the TEVs when reading from a disabled texture slot.
vec4 tev_texture_sources[4] = vec4[](vec4(0.0), vec4(0.0), vec4(0.0), vec4(0.0));
// TODO: presumably this needs to be initialized to the value of GPUREG_TEXENV_BUFFER_COLOR
vec4 buffer;
vec4 next_buffer;
// TODO: figure out the correct "initial" value returned to TEV0 when reading the "previous" source.
vec4 tev_previous = vec4(0.0);
vec4 tev_previous_buffer[2];
bool tev_unimplemented_source = false;
@ -69,23 +70,21 @@ const char* fragmentShader = R"(
uint rgb_source = (u_textureEnvSource[tev_id] >> (src_id * 4)) & 15u;
uint alpha_source = (u_textureEnvSource[tev_id] >> (16 + src_id * 4)) & 15u;
// TODO: get rid of redundant texture fetches during TEV evaluation.
switch (rgb_source) {
case 0u: source.rgb = colour.rgb; break; // Primary color, TODO: confirm that this is correct
case 3u: source.rgb = texture(u_tex0, tex0_UVs).rgb; break; // Texture 0
case 13u: source.rgb = buffer.rgb; break; // Previous buffer
case 3u: source.rgb = tev_texture_sources[0].rgb; break; // Texture 0
case 13u: source.rgb = tev_previous_buffer[0].rgb; break; // Previous buffer
case 14u: source.rgb = u_textureEnvColor[tev_id].rgb; break; // Constant (GPUREG_TEXENVi_COLOR)
case 15u: source.rgb = previous.rgb; break; // Previous (output from TEV #n-1)
case 15u: source.rgb = tev_previous.rgb; break; // Previous (output from TEV #n-1)
default: tev_unimplemented_source = true; break; // TODO: implement remaining sources
}
switch (alpha_source) {
case 0u: source.a = colour.a; break; // Primary color, TODO: confirm that this is correct
case 3u: source.a = texture(u_tex0, tex0_UVs).a; break; // Texture 0
case 13u: source.a = buffer.a; break; // Previous buffer
case 3u: source.a = tev_texture_sources[0].a; break; // Texture 0
case 13u: source.a = tev_previous_buffer[0].a; break; // Previous buffer
case 14u: source.a = u_textureEnvColor[tev_id].a; break; // Constant (GPUREG_TEXENVi_COLOR)
case 15u: source.a = previous.a; break; // Previous (output from TEV #n-1)
case 15u: source.a = tev_previous.a; break; // Previous (output from TEV #n-1)
default: tev_unimplemented_source = true; break; // TODO: implement remaining sources
}
@ -166,42 +165,40 @@ const char* fragmentShader = R"(
}
void main() {
if ((u_textureConfig & 1u) != 0) { // Render texture 0 if enabled
// TODO: fix all the redundancy
if ((u_textureConfig & 1u) != 0u) tev_texture_sources[0] = texture(u_tex0, tex0_UVs);
buffer = vec4(0.0);
next_buffer = u_textureEnvBufferColor;
// TODO: make TEV logic less redundant
previous = tev_combine(0);
buffer = next_buffer;
if ((u_textureEnvUpdateBuffer & 0x100u) != 0u) next_buffer.rgb = previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x1000u) != 0u) next_buffer.a = previous.a;
tev_previous_buffer[0] = vec4(0.0);
tev_previous_buffer[1] = u_textureEnvBufferColor;
previous = tev_combine(1);
buffer = next_buffer;
if ((u_textureEnvUpdateBuffer & 0x200u) != 0u) next_buffer.rgb = previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x2000u) != 0u) next_buffer.a = previous.a;
tev_previous = tev_combine(0);
tev_previous_buffer[0] = tev_previous_buffer[1];
if ((u_textureEnvUpdateBuffer & 0x100u) != 0u) tev_previous_buffer[1].rgb = tev_previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x1000u) != 0u) tev_previous_buffer[1].a = tev_previous.a;
previous = tev_combine(2);
buffer = next_buffer;
if ((u_textureEnvUpdateBuffer & 0x400u) != 0u) next_buffer.rgb = previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x4000u) != 0u) next_buffer.a = previous.a;
tev_previous = tev_combine(1);
tev_previous_buffer[0] = tev_previous_buffer[1];
if ((u_textureEnvUpdateBuffer & 0x200u) != 0u) tev_previous_buffer[1].rgb = tev_previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x2000u) != 0u) tev_previous_buffer[1].a = tev_previous.a;
previous = tev_combine(3);
buffer = next_buffer;
if ((u_textureEnvUpdateBuffer & 0x800u) != 0u) next_buffer.rgb = previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x8000u) != 0u) next_buffer.a = previous.a;
tev_previous = tev_combine(2);
tev_previous_buffer[0] = tev_previous_buffer[1];
if ((u_textureEnvUpdateBuffer & 0x400u) != 0u) tev_previous_buffer[1].rgb = tev_previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x4000u) != 0u) tev_previous_buffer[1].a = tev_previous.a;
previous = tev_combine(4);
buffer = next_buffer;
tev_previous = tev_combine(3);
tev_previous_buffer[0] = tev_previous_buffer[1];
if ((u_textureEnvUpdateBuffer & 0x800u) != 0u) tev_previous_buffer[1].rgb = tev_previous.rgb;
if ((u_textureEnvUpdateBuffer & 0x8000u) != 0u) tev_previous_buffer[1].a = tev_previous.a;
fragColour = tev_combine(5);
tev_previous = tev_combine(4);
tev_previous_buffer[0] = tev_previous_buffer[1];
if (tev_unimplemented_source) {
fragColour = vec4(1.0, 0.0, 1.0, 1.0);
}
} else {
fragColour = colour;
fragColour = tev_combine(5);
if (tev_unimplemented_source) {
// fragColour = vec4(1.0, 0.0, 1.0, 1.0);
}
// Get original depth value by converting from [near, far] = [0, 1] to [-1, 1]