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gl_rasterizer/lighting: implement shadow attenuation

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This commit is contained in:
wwylele 2018-04-01 18:22:14 +03:00
parent b5763cb952
commit 4256641da4
2 changed files with 50 additions and 2 deletions
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44
src/video_core/renderer_opengl/gl_shader_gen.cpp
View file

@ -115,6 +115,7 @@ PicaShaderConfig PicaShaderConfig::BuildFromRegs(const Pica::Regs& regs) {
!regs.lighting.IsDistAttenDisabled(num);
state.lighting.light[light_index].spot_atten_enable =
!regs.lighting.IsSpotAttenDisabled(num);
state.lighting.light[light_index].shadow_enable = !regs.lighting.IsShadowDisabled(num);
}
state.lighting.lut_d0.enable = regs.lighting.config1.disable_lut_d0 == 0;
@ -161,6 +162,13 @@ PicaShaderConfig PicaShaderConfig::BuildFromRegs(const Pica::Regs& regs) {
state.lighting.bump_renorm = regs.lighting.config0.disable_bump_renorm == 0;
state.lighting.clamp_highlights = regs.lighting.config0.clamp_highlights != 0;
state.lighting.enable_shadow = regs.lighting.config0.enable_shadow != 0;
state.lighting.shadow_primary = regs.lighting.config0.shadow_primary != 0;
state.lighting.shadow_secondary = regs.lighting.config0.shadow_secondary != 0;
state.lighting.shadow_invert = regs.lighting.config0.shadow_invert != 0;
state.lighting.shadow_alpha = regs.lighting.config0.shadow_alpha != 0;
state.lighting.shadow_selector = regs.lighting.config0.shadow_selector;
state.proctex.enable = regs.texturing.main_config.texture3_enable;
if (state.proctex.enable) {
state.proctex.coord = regs.texturing.main_config.texture3_coordinates;
@ -203,6 +211,11 @@ static std::string SampleTexture(const PicaShaderConfig& config, unsigned textur
return "textureProj(tex[0], vec3(texcoord[0], texcoord0_w))";
case TexturingRegs::TextureConfig::TextureCube:
return "texture(tex_cube, vec3(texcoord[0], texcoord0_w))";
case TexturingRegs::TextureConfig::Shadow2D:
case TexturingRegs::TextureConfig::ShadowCube:
NGLOG_CRITICAL(HW_GPU, "Unhandled shadow texture");
UNIMPLEMENTED();
return "vec4(1.0)"; // stubbed to avoid rendering with wrong shadow
default:
LOG_CRITICAL(HW_GPU, "Unhandled texture type %x",
static_cast<int>(state.texture0_type));
@ -606,6 +619,17 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
out += "vec3 normal = quaternion_rotate(normalized_normquat, surface_normal);\n";
out += "vec3 tangent = quaternion_rotate(normalized_normquat, surface_tangent);\n";
if (lighting.enable_shadow) {
std::string shadow_texture = SampleTexture(config, lighting.shadow_selector);
if (lighting.shadow_invert) {
out += "vec4 shadow = vec4(1.0) - " + shadow_texture + ";\n";
} else {
out += "vec4 shadow = " + shadow_texture + ";\n";
}
} else {
out += "vec4 shadow = vec4(1.0);\n";
}
// Samples the specified lookup table for specular lighting
auto GetLutValue = [&lighting](LightingRegs::LightingSampler sampler, unsigned light_num,
LightingRegs::LightingLutInput input, bool abs) {
@ -814,13 +838,29 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
}
}
bool shadow_primary_enable = lighting.shadow_primary && light_config.shadow_enable;
bool shadow_secondary_enable = lighting.shadow_secondary && light_config.shadow_enable;
std::string shadow_primary = shadow_primary_enable ? " * shadow.rgb" : "";
std::string shadow_secondary = shadow_secondary_enable ? " * shadow.rgb" : "";
// Compute primary fragment color (diffuse lighting) function
out += "diffuse_sum.rgb += ((" + light_src + ".diffuse * dot_product) + " + light_src +
".ambient) * " + dist_atten + " * " + spot_atten + ";\n";
".ambient) * " + dist_atten + " * " + spot_atten + shadow_primary + ";\n";
// Compute secondary fragment color (specular lighting) function
out += "specular_sum.rgb += (" + specular_0 + " + " + specular_1 +
") * clamp_highlights * " + dist_atten + " * " + spot_atten + ";\n";
") * clamp_highlights * " + dist_atten + " * " + spot_atten + shadow_secondary +
";\n";
}
// Apply shadow attenuation to alpha components if enabled
if (lighting.shadow_alpha) {
if (lighting.enable_primary_alpha) {
out += "diffuse_sum.a *= shadow.a;\n";
}
if (lighting.enable_secondary_alpha) {
out += "specular_sum.a *= shadow.a;\n";
}
}
// Sum final lighting result

8
src/video_core/renderer_opengl/gl_shader_gen.h
View file

@ -66,6 +66,7 @@ struct PicaShaderConfigState {
bool spot_atten_enable;
bool geometric_factor_0;
bool geometric_factor_1;
bool shadow_enable;
} light[8];
bool enable;
@ -79,6 +80,13 @@ struct PicaShaderConfigState {
bool enable_primary_alpha;
bool enable_secondary_alpha;
bool enable_shadow;
bool shadow_primary;
bool shadow_secondary;
bool shadow_invert;
bool shadow_alpha;
unsigned shadow_selector;
struct {
bool enable;
bool abs_input;