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[GPU] implement TEV combiner chaining and the remaining combine modes

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This commit is contained in:
fleroviux 2023-06-16 00:33:42 +02:00
parent 525890bff7
commit e7435e3fdf
1 changed files with 48 additions and 22 deletions
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70
src/core/renderer_gl/renderer_gl.cpp
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@ -52,30 +52,35 @@ const char* fragmentShader = R"(
uniform sampler2D u_tex0;
vec4 tev_evaluate_source(int src_id) {
// TODO: figure out what the correct "initial" value used by TEV0 is.
vec4 previous = vec4(1.0);
vec4 tev_evaluate_source(int tev_id, int src_id) {
vec4 source = vec4(1.0);
uint rgb_source = (u_textureEnvSource[0] >> (src_id * 4)) & 15u;
uint alpha_source = (u_textureEnvSource[0] >> (16 + src_id * 4)) & 15u;
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 14u: source.rgb = u_textureEnvColor[0].rgb; break; // Constant (GPUREG_TEXENVi_COLOR)
default: break; // TODO: implement remaining sources
case 14u: source.rgb = u_textureEnvColor[tev_id].rgb; break; // Constant (GPUREG_TEXENVi_COLOR)
case 15u: source.rgb = previous.rgb; // Previous (output from TEV #n-1)
default: return vec4(0.0, 1.0, 1.0, 1.0); 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 14u: source.a = u_textureEnvColor[0].a; break; // Constant (GPUREG_TEXENVi_COLOR)
default: break; // TODO: implement remaining sources
case 14u: source.a = u_textureEnvColor[tev_id].a; break; // Constant (GPUREG_TEXENVi_COLOR)
case 15u: source.a = previous.a; // Previous (output from TEV #n-1)
default: return vec4(0.0, 1.0, 1.0, 1.0); break; // TODO: implement remaining sources
}
uint rgb_operand = (u_textureEnvOperand[0] >> (src_id * 4)) & 15u;
uint alpha_operand = (u_textureEnvOperand[0] >> (12 + src_id * 4)) & 7u;
uint rgb_operand = (u_textureEnvOperand[tev_id] >> (src_id * 4)) & 15u;
uint alpha_operand = (u_textureEnvOperand[tev_id] >> (12 + src_id * 4)) & 7u;
vec4 final;
@ -109,26 +114,42 @@ const char* fragmentShader = R"(
return final;
}
vec4 tev_combine() {
vec4 source0 = tev_evaluate_source(0);
vec4 source1 = tev_evaluate_source(1);
vec4 source2 = tev_evaluate_source(2);
vec4 tev_combine(int tev_id) {
vec4 source0 = tev_evaluate_source(tev_id, 0);
vec4 source1 = tev_evaluate_source(tev_id, 1);
vec4 source2 = tev_evaluate_source(tev_id, 2);
uint rgb_combine = u_textureEnvCombiner[0] & 15u;
uint alpha_combine = (u_textureEnvCombiner[0] >> 16) & 15u;
uint rgb_combine = u_textureEnvCombiner[tev_id] & 15u;
uint alpha_combine = (u_textureEnvCombiner[tev_id] >> 16) & 15u;
vec4 result = vec4(1.0);
// TODO: figure out how most of the combine modes work.
switch (rgb_combine) {
case 1u: result.rgb = source0.rgb * source1.rgb * source2.rgb; break; // Modulate
default: return vec4(1.0, 0.0, 0.0, 1.0);
case 0u: result.rgb = source0.rgb; break; // Replace
case 1u: result.rgb = source0.rgb * source1.rgb; break; // Modulate
case 2u: result.rgb = min(vec3(1.0), source0.rgb + source1.rgb); break; // Add
case 3u: result.rgb = clamp(source0.rgb + source1.rgb - 0.5, vec3(0.0), vec3(1.0)); break; // Add signed
case 4u: result.rgb = mix(source0.rgb, source1.rgb, source2.rgb); break; // Interpolate
case 5u: result.rgb = max(vec3(0.0), source0.rgb - source1.rgb); break; // Subtract
case 6u: result.rgb = vec3(dot(source0.rgb, source1.rgb)); break; // Dot3 RGB
case 7u: result.rgb = vec3(dot(source0, source1)); break; // Dot3 RGBA, TODO: not sure if this is correct?
case 8u: result.rgb = min(vec3(1.0), source0.rgb * source1.rgb + source2.rgb); break; // Multiply then add
case 9u: result.rgb = min(vec3(1.0), (source0.rgb + source1.rgb) * source2.rgb); break; // Add then multiply
default: break; // TODO: figure out what the undocumented values do
}
switch (alpha_combine) {
case 1u: result.a = source0.a * source1.a * source2.a; break; // Modulate
default: return vec4(1.0, 0.0, 0.0, 1.0);
case 0u: result.a = source0.a; break; // Replace
case 1u: result.a = source0.a * source1.a; break; // Modulate
case 2u: result.a = min(1.0, source0.a + source1.a); break; // Add
case 3u: result.a = clamp(source0.a + source1.a - 0.5, 0.0, 1.0); break; // Add signed
case 4u: result.a = mix(source0.a, source1.a, source2.a); break; // Interpolate
case 5u: result.a = max(0.0, source0.a - source1.a); break; // Subtract
case 6u: result.a = dot(source0.rgb, source1.rgb); break; // Dot3 RGB
case 7u: result.a = dot(source0, source1); break; // Dot3 RGBA, TODO: not sure if this is correct?
case 8u: result.a = min(1.0, source0.a * source1.a + source2.a); break; // Multiply then add
case 9u: result.a = min(1.0, (source0.a + source1.a) * source2.a); break; // Add then multiply
default: break; // TODO: figure out what the undocumented values do
}
return result;
@ -136,7 +157,12 @@ const char* fragmentShader = R"(
void main() {
if ((u_textureConfig & 1u) != 0) { // Render texture 0 if enabled
fragColour = tev_combine();
previous = tev_combine(0);
previous = tev_combine(1);
previous = tev_combine(2);
fragColour = tev_combine(3);
// fragColour = tev_combine(0);
} else {
fragColour = colour;
}