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GPU: Implement support for multisample antialiasing

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This commit is contained in:
Connor McLaughlin
2020-10-31 00:38:06 +10:00
parent 61a4960380
commit 2eaebd8921
28 changed files with 804 additions and 407 deletions
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92
src/core/gpu_hw_shadergen.cpp
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@ -3,9 +3,11 @@
#include <cstdio>
#include <glad.h>
GPU_HW_ShaderGen::GPU_HW_ShaderGen(HostDisplay::RenderAPI render_api, u32 resolution_scale, bool true_color, bool scaled_dithering, GPUTextureFilter texture_filtering, bool uv_limits, bool supports_dual_source_blend) :
ShaderGen(render_api, supports_dual_source_blend),
m_resolution_scale(resolution_scale), m_true_color(true_color),
GPU_HW_ShaderGen::GPU_HW_ShaderGen(HostDisplay::RenderAPI render_api, u32 resolution_scale, u32 multisamples,
bool per_sample_shading, bool true_color, bool scaled_dithering,
GPUTextureFilter texture_filtering, bool uv_limits, bool supports_dual_source_blend)
: ShaderGen(render_api, supports_dual_source_blend), m_resolution_scale(resolution_scale),
m_multisamples(multisamples), m_true_color(true_color), m_per_sample_shading(per_sample_shading),
m_scaled_dithering(scaled_dithering), m_texture_filter(texture_filtering), m_uv_limits(uv_limits)
{
}
@ -14,9 +16,13 @@ GPU_HW_ShaderGen::~GPU_HW_ShaderGen() = default;
void GPU_HW_ShaderGen::WriteCommonFunctions(std::stringstream& ss)
{
DefineMacro(ss, "MULTISAMPLING", UsingMSAA());
ss << "CONSTANT uint RESOLUTION_SCALE = " << m_resolution_scale << "u;\n";
ss << "CONSTANT uint2 VRAM_SIZE = uint2(" << GPU::VRAM_WIDTH << ", " << GPU::VRAM_HEIGHT << ") * RESOLUTION_SCALE;\n";
ss << "CONSTANT float2 RCP_VRAM_SIZE = float2(1.0, 1.0) / float2(VRAM_SIZE);\n";
ss << "CONSTANT uint MULTISAMPLES = " << m_multisamples << "u;\n";
ss << "CONSTANT bool PER_SAMPLE_SHADING = " << (m_per_sample_shading ? "true" : "false") << ";\n";
ss << R"(
float fixYCoord(float y)
@ -90,17 +96,20 @@ std::string GPU_HW_ShaderGen::GenerateBatchVertexShader(bool textured)
{
DeclareVertexEntryPoint(
ss, {"float4 a_pos", "float4 a_col0", "uint a_texcoord", "uint a_texpage", "float4 a_uv_limits"}, 1, 1,
{{"nointerpolation", "uint4 v_texpage"}, {"nointerpolation", "float4 v_uv_limits"}}, false);
{{"nointerpolation", "uint4 v_texpage"}, {"nointerpolation", "float4 v_uv_limits"}}, false, "", UsingMSAA(),
UsingPerSampleShading());
}
else
{
DeclareVertexEntryPoint(ss, {"float4 a_pos", "float4 a_col0", "uint a_texcoord", "uint a_texpage"}, 1, 1,
{{"nointerpolation", "uint4 v_texpage"}}, false);
{{"nointerpolation", "uint4 v_texpage"}}, false, "", UsingMSAA(),
UsingPerSampleShading());
}
}
else
{
DeclareVertexEntryPoint(ss, {"float4 a_pos", "float4 a_col0"}, 1, 0, {}, false);
DeclareVertexEntryPoint(ss, {"float4 a_pos", "float4 a_col0"}, 1, 0, {}, false, "", UsingMSAA(),
UsingPerSampleShading());
}
ss << R"(
@ -767,17 +776,17 @@ float4 SampleFromVRAM(uint4 texpage, float2 coords)
{
DeclareFragmentEntryPoint(ss, 1, 1,
{{"nointerpolation", "uint4 v_texpage"}, {"nointerpolation", "float4 v_uv_limits"}},
true, use_dual_source ? 2 : 1, true);
true, use_dual_source ? 2 : 1, true, UsingMSAA(), UsingPerSampleShading());
}
else
{
DeclareFragmentEntryPoint(ss, 1, 1, {{"nointerpolation", "uint4 v_texpage"}}, true, use_dual_source ? 2 : 1,
true);
DeclareFragmentEntryPoint(ss, 1, 1, {{"nointerpolation", "uint4 v_texpage"}}, true, use_dual_source ? 2 : 1, true,
UsingMSAA(), UsingPerSampleShading());
}
}
else
{
DeclareFragmentEntryPoint(ss, 1, 0, {}, true, use_dual_source ? 2 : 1, true);
DeclareFragmentEntryPoint(ss, 1, 0, {}, true, use_dual_source ? 2 : 1, true, UsingMSAA(), UsingPerSampleShading());
}
ss << R"(
@ -976,7 +985,22 @@ std::string GPU_HW_ShaderGen::GenerateDisplayFragmentShader(bool depth_24bit,
WriteCommonFunctions(ss);
DeclareUniformBuffer(ss, {"uint2 u_vram_offset", "uint u_crop_left", "uint u_field_offset"}, true);
DeclareTexture(ss, "samp0", 0);
DeclareTexture(ss, "samp0", 0, UsingMSAA());
ss << R"(
float4 LoadVRAM(int2 coords)
{
#if MULTISAMPLING
float4 value = LOAD_TEXTURE_MS(samp0, coords, 0u);
for (uint sample_index = 1u; sample_index < MULTISAMPLES; sample_index++)
value += LOAD_TEXTURE_MS(samp0, coords, sample_index);
value /= float(MULTISAMPLES);
return value;
#else
return LOAD_TEXTURE(samp0, coords, 0);
#endif
}
)";
DeclareFragmentEntryPoint(ss, 0, 1, {}, true, 1);
ss << R"(
@ -1000,8 +1024,8 @@ std::string GPU_HW_ShaderGen::GenerateDisplayFragmentShader(bool depth_24bit,
uint2 vram_coords = u_vram_offset + uint2(((relative_x * 3u) / 2u) * RESOLUTION_SCALE, icoords.y);
// load adjacent 16-bit texels
uint s0 = RGBA8ToRGBA5551(LOAD_TEXTURE(samp0, int2(vram_coords % VRAM_SIZE), 0));
uint s1 = RGBA8ToRGBA5551(LOAD_TEXTURE(samp0, int2((vram_coords + uint2(RESOLUTION_SCALE, 0)) % VRAM_SIZE), 0));
uint s0 = RGBA8ToRGBA5551(LoadVRAM(int2(vram_coords % VRAM_SIZE)));
uint s1 = RGBA8ToRGBA5551(LoadVRAM(int2((vram_coords + uint2(RESOLUTION_SCALE, 0)) % VRAM_SIZE)));
// select which part of the combined 16-bit texels we are currently shading
uint s1s0 = ((s1 << 16) | s0) >> ((relative_x & 1u) * 8u);
@ -1012,7 +1036,7 @@ std::string GPU_HW_ShaderGen::GenerateDisplayFragmentShader(bool depth_24bit,
#else
// load and return
uint2 vram_coords = u_vram_offset + uint2(icoords.x + u_crop_left, icoords.y);
o_col0 = LOAD_TEXTURE(samp0, int2(vram_coords % VRAM_SIZE), 0);
o_col0 = LoadVRAM(int2(vram_coords % VRAM_SIZE));
#endif
}
)";
@ -1027,13 +1051,26 @@ std::string GPU_HW_ShaderGen::GenerateVRAMReadFragmentShader()
WriteCommonFunctions(ss);
DeclareUniformBuffer(ss, {"uint2 u_base_coords", "uint2 u_size"}, true);
DeclareTexture(ss, "samp0", 0);
DeclareTexture(ss, "samp0", 0, UsingMSAA());
ss << R"(
float4 LoadVRAM(int2 coords)
{
#if MULTISAMPLING
float4 value = LOAD_TEXTURE_MS(samp0, coords, 0u);
for (uint sample_index = 1u; sample_index < MULTISAMPLES; sample_index++)
value += LOAD_TEXTURE_MS(samp0, coords, sample_index);
value /= float(MULTISAMPLES);
return value;
#else
return LOAD_TEXTURE(samp0, coords, 0);
#endif
}
uint SampleVRAM(uint2 coords)
{
if (RESOLUTION_SCALE == 1u)
return RGBA8ToRGBA5551(LOAD_TEXTURE(samp0, int2(coords), 0));
return RGBA8ToRGBA5551(LoadVRAM(int2(coords)));
// Box filter for downsampling.
float4 value = float4(0.0, 0.0, 0.0, 0.0);
@ -1041,7 +1078,7 @@ uint SampleVRAM(uint2 coords)
for (uint offset_x = 0u; offset_x < RESOLUTION_SCALE; offset_x++)
{
for (uint offset_y = 0u; offset_y < RESOLUTION_SCALE; offset_y++)
value += LOAD_TEXTURE(samp0, int2(base_coords + uint2(offset_x, offset_y)), 0);
value += LoadVRAM(int2(base_coords + uint2(offset_x, offset_y)));
}
value /= float(RESOLUTION_SCALE * RESOLUTION_SCALE);
return RGBA8ToRGBA5551(value);
@ -1133,6 +1170,9 @@ std::string GPU_HW_ShaderGen::GenerateVRAMWriteFragmentShader(bool use_ssbo)
std::string GPU_HW_ShaderGen::GenerateVRAMCopyFragmentShader()
{
// TODO: This won't currently work because we can't bind the texture to both the shader and framebuffer.
const bool msaa = false;
std::stringstream ss;
WriteHeader(ss);
WriteCommonFunctions(ss);
@ -1141,8 +1181,9 @@ std::string GPU_HW_ShaderGen::GenerateVRAMCopyFragmentShader()
"bool u_set_mask_bit", "float u_depth_value"},
true);
DeclareTexture(ss, "samp0", 0);
DeclareFragmentEntryPoint(ss, 0, 1, {}, true, 1, true);
DeclareTexture(ss, "samp0", 0, msaa);
DefineMacro(ss, "MSAA_COPY", msaa);
DeclareFragmentEntryPoint(ss, 0, 1, {}, true, 1, true, false, false, msaa);
ss << R"(
{
uint2 dst_coords = uint2(v_pos.xy);
@ -1163,7 +1204,11 @@ std::string GPU_HW_ShaderGen::GenerateVRAMCopyFragmentShader()
uint2 src_coords = (u_src_coords + offset) % VRAM_SIZE;
// sample and apply mask bit
#if MSAA_COPY
float4 color = LOAD_TEXTURE_MS(samp0, int2(src_coords), f_sample_index);
#else
float4 color = LOAD_TEXTURE(samp0, int2(src_coords), 0);
#endif
o_col0 = float4(color.xyz, u_set_mask_bit ? 1.0 : color.a);
o_depth = (u_set_mask_bit ? 1.0f : ((o_col0.a == 1.0) ? u_depth_value : 0.0));
})";
@ -1175,12 +1220,17 @@ std::string GPU_HW_ShaderGen::GenerateVRAMUpdateDepthFragmentShader()
{
std::stringstream ss;
WriteHeader(ss);
DeclareTexture(ss, "samp0", 0);
DeclareFragmentEntryPoint(ss, 0, 1, {}, true, 0, true);
WriteCommonFunctions(ss);
DeclareTexture(ss, "samp0", 0, UsingMSAA());
DeclareFragmentEntryPoint(ss, 0, 1, {}, true, 0, true, false, false, UsingMSAA());
ss << R"(
{
#if MULTISAMPLING
o_depth = LOAD_TEXTURE_MS(samp0, int2(v_pos.xy), f_sample_index).a;
#else
o_depth = LOAD_TEXTURE(samp0, int2(v_pos.xy), 0).a;
#endif
}
)";