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renderer_opengl: Implement HW fragment lighting distance attenuation.

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This commit is contained in:
bunnei 2015-11-13 23:04:19 -05:00
parent e9af70eaf3
commit e34fa6365f
2 changed files with 37 additions and 16 deletions
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34
src/video_core/renderer_opengl/gl_rasterizer.h
View file

@ -78,9 +78,13 @@ struct PicaShaderConfig {
for (unsigned light_index = 0; light_index < res.num_lights; ++light_index) {
unsigned num = regs.lighting.light_enable.GetNum(light_index);
const auto& light = regs.lighting.light[num];
res.light_src[light_index].num = num;
res.light_src[light_index].directional = regs.lighting.light[num].w;
res.light_src[light_index].two_sided_diffuse = regs.lighting.light[num].two_sided_diffuse;
res.light_src[light_index].directional = light.w;
res.light_src[light_index].two_sided_diffuse = light.two_sided_diffuse;
res.light_src[light_index].dist_atten_enabled = regs.lighting.dist_atten_enable.IsEnabled(num);
res.light_src[light_index].dist_atten_bias = Pica::float20::FromRawFloat20(light.dist_atten_bias).ToFloat32();
res.light_src[light_index].dist_atten_scale = Pica::float20::FromRawFloat20(light.dist_atten_scale).ToFloat32();
}
return res;
@ -98,19 +102,23 @@ struct PicaShaderConfig {
return std::memcmp(this, &o, sizeof(PicaShaderConfig)) == 0;
};
Pica::Regs::CompareFunc alpha_test_func;
std::array<Pica::Regs::TevStageConfig, 6> tev_stages = {};
u8 combiner_buffer_input;
struct {
unsigned num;
bool directional;
bool two_sided_diffuse;
bool dist_atten_enabled;
} light_src[8];
Pica::Regs::CompareFunc alpha_test_func = Pica::Regs::CompareFunc::Never;
std::array<Pica::Regs::TevStageConfig, 6> tev_stages = {};
u8 combiner_buffer_input = 0;
bool lighting_enabled;
unsigned num_lights;
struct {
unsigned num = 0;
bool directional = false;
bool two_sided_diffuse = false;
bool dist_atten_enabled = false;
GLfloat dist_atten_scale = 0.0f;
GLfloat dist_atten_bias = 0.0f;
} light_src[8];
bool lighting_enabled = false;
unsigned num_lights = 0;
};
};
namespace std {

19
src/video_core/renderer_opengl/gl_shader_gen.cpp
View file

@ -371,12 +371,13 @@ vec4 primary_fragment_color = vec4(0.0);
for (unsigned light_index = 0; light_index < config.num_lights; ++light_index) {
unsigned num = config.light_src[light_index].num;
std::string light_src = "light_src[" + std::to_string(num) + "]";
std::string light_vector;
if (config.light_src[light_index].directional)
light_vector = "normalize(-light_src[" + std::to_string(num) + "].position)";
light_vector = "normalize(-" + light_src + ".position)";
else
light_vector = "normalize(light_src[" + std::to_string(num) + "].position - fragment_position)";
light_vector = "normalize(" + light_src + ".position - fragment_position)";
std::string dot_product;
if (config.light_src[light_index].two_sided_diffuse)
@ -384,7 +385,19 @@ vec4 primary_fragment_color = vec4(0.0);
else
dot_product = "max(dot(" + light_vector + ", normal), 0.0)";
out += "diffuse_sum += ((light_src[" + std::to_string(num) + "].diffuse * " + dot_product + ") + light_src[" + std::to_string(num) + "].ambient) * 1.0;\n";
std::string dist_atten = "1.0";
if (config.light_src[light_index].dist_atten_enabled) {
std::string scale = std::to_string(config.light_src[light_index].dist_atten_scale);
std::string bias = std::to_string(config.light_src[light_index].dist_atten_bias);
std::string lut_index = "(" + scale + " * length(fragment_position - " + light_src + ".position) + " + bias + ")";
std::string clamped_lut_index = "((clamp(int(" + lut_index + " * 256.0), 0, 255)))";
unsigned lut_num = ((unsigned)Regs::LightingSampler::DistanceAttenuation + num);
dist_atten = "lighting_lut_" + std::to_string(lut_num /4) + "[" + clamped_lut_index + "][" + std::to_string(lut_num & 3) + "]";
}
out += "diffuse_sum += ((light_src[" + std::to_string(num) + "].diffuse * " + dot_product + ") + light_src[" + std::to_string(num) + "].ambient) * " + dist_atten + ";\n";
}
out += "diffuse_sum += lighting_global_ambient;\n";