diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h index c8af1c6b67..0e09a7ee55 100644 --- a/src/video_core/engines/maxwell_3d.h +++ b/src/video_core/engines/maxwell_3d.h @@ -643,8 +643,10 @@ public: u32 d3d_cull_mode; ComparisonOp depth_test_func; + float alpha_test_ref; + ComparisonOp alpha_test_func; - INSERT_PADDING_WORDS(0xB); + INSERT_PADDING_WORDS(0x9); struct { u32 separate_alpha; diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp index 3daccf82f0..be51c5215f 100644 --- a/src/video_core/renderer_opengl/gl_rasterizer.cpp +++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp @@ -570,10 +570,11 @@ void RasterizerOpenGL::DrawArrays() { SyncBlendState(); SyncLogicOpState(); SyncCullMode(); - SyncAlphaTest(); SyncScissorTest(); + // Alpha Testing is synced on shaders. SyncTransformFeedback(); SyncPointState(); + CheckAlphaTests(); // TODO(bunnei): Sync framebuffer_scale uniform here // TODO(bunnei): Sync scissorbox uniform(s) here @@ -1007,17 +1008,6 @@ void RasterizerOpenGL::SyncLogicOpState() { state.logic_op.operation = MaxwellToGL::LogicOp(regs.logic_op.operation); } -void RasterizerOpenGL::SyncAlphaTest() { - const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs; - - // TODO(Rodrigo): Alpha testing is a legacy OpenGL feature, but it can be - // implemented with a test+discard in fragment shaders. - if (regs.alpha_test_enabled != 0) { - LOG_CRITICAL(Render_OpenGL, "Alpha testing is not implemented"); - UNREACHABLE(); - } -} - void RasterizerOpenGL::SyncScissorTest() { const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs; @@ -1052,4 +1042,15 @@ void RasterizerOpenGL::SyncPointState() { state.point.size = regs.point_size == 0 ? 1 : regs.point_size; } +void RasterizerOpenGL::CheckAlphaTests() { + const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs; + + if (regs.alpha_test_enabled != 0 && regs.rt_control.count > 1) { + LOG_CRITICAL( + Render_OpenGL, + "Alpha Testing is enabled with Multiple Render Targets, this behavior is undefined."); + UNREACHABLE(); + } +} + } // namespace OpenGL diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h index b1f7ccc7e7..0e90a31f5e 100644 --- a/src/video_core/renderer_opengl/gl_rasterizer.h +++ b/src/video_core/renderer_opengl/gl_rasterizer.h @@ -162,9 +162,6 @@ private: /// Syncs the LogicOp state to match the guest state void SyncLogicOpState(); - /// Syncs the alpha test state to match the guest state - void SyncAlphaTest(); - /// Syncs the scissor test state to match the guest state void SyncScissorTest(); @@ -174,6 +171,9 @@ private: /// Syncs the point state to match the guest state void SyncPointState(); + /// Check asserts for alpha testing. + void CheckAlphaTests(); + bool has_ARB_direct_state_access = false; bool has_ARB_multi_bind = false; bool has_ARB_separate_shader_objects = false; diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp index d36f190b7d..7a019fc860 100644 --- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp +++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp @@ -1266,9 +1266,29 @@ private: ASSERT_MSG(header.ps.omap.sample_mask == 0, "Samplemask write is unimplemented"); + shader.AddLine("if (alpha_test[0] != 0) {"); + ++shader.scope; + // We start on the register containing the alpha value in the first RT. + u32 current_reg = 3; + for (u32 render_target = 0; render_target < Maxwell3D::Regs::NumRenderTargets; + ++render_target) { + // TODO(Blinkhawk): verify the behavior of alpha testing on hardware when + // multiple render targets are used. + if (header.ps.IsColorComponentOutputEnabled(render_target, 0) || + header.ps.IsColorComponentOutputEnabled(render_target, 1) || + header.ps.IsColorComponentOutputEnabled(render_target, 2) || + header.ps.IsColorComponentOutputEnabled(render_target, 3)) { + shader.AddLine(fmt::format("if (!AlphaFunc({})) discard;", + regs.GetRegisterAsFloat(current_reg))); + current_reg += 4; + } + } + --shader.scope; + shader.AddLine('}'); + // Write the color outputs using the data in the shader registers, disabled // rendertargets/components are skipped in the register assignment. - u32 current_reg = 0; + current_reg = 0; for (u32 render_target = 0; render_target < Maxwell3D::Regs::NumRenderTargets; ++render_target) { // TODO(Subv): Figure out how dual-source blending is configured in the Switch. @@ -3516,7 +3536,7 @@ private: // Declarations std::set declr_predicates; -}; // namespace Decompiler +}; // namespace OpenGL::GLShader::Decompiler std::string GetCommonDeclarations() { return fmt::format("#define MAX_CONSTBUFFER_ELEMENTS {}\n", diff --git a/src/video_core/renderer_opengl/gl_shader_gen.cpp b/src/video_core/renderer_opengl/gl_shader_gen.cpp index ecbc9d8ed3..e883ffb1df 100644 --- a/src/video_core/renderer_opengl/gl_shader_gen.cpp +++ b/src/video_core/renderer_opengl/gl_shader_gen.cpp @@ -29,6 +29,7 @@ layout(std140) uniform vs_config { vec4 viewport_flip; uvec4 instance_id; uvec4 flip_stage; + uvec4 alpha_test; }; )"; @@ -105,6 +106,7 @@ layout (std140) uniform gs_config { vec4 viewport_flip; uvec4 instance_id; uvec4 flip_stage; + uvec4 alpha_test; }; void main() { @@ -142,8 +144,33 @@ layout (std140) uniform fs_config { vec4 viewport_flip; uvec4 instance_id; uvec4 flip_stage; + uvec4 alpha_test; }; +bool AlphaFunc(in float value) { + float ref = uintBitsToFloat(alpha_test[2]); + switch (alpha_test[1]) { + case 1: + return false; + case 2: + return value < ref; + case 3: + return value == ref; + case 4: + return value <= ref; + case 5: + return value > ref; + case 6: + return value != ref; + case 7: + return value >= ref; + case 8: + return true; + default: + return false; + } +} + void main() { exec_fragment(); } @@ -152,4 +179,4 @@ void main() { out += program.first; return {out, program.second}; } -} // namespace OpenGL::GLShader \ No newline at end of file +} // namespace OpenGL::GLShader diff --git a/src/video_core/renderer_opengl/gl_shader_manager.cpp b/src/video_core/renderer_opengl/gl_shader_manager.cpp index 010857ec62..8b8869ecbf 100644 --- a/src/video_core/renderer_opengl/gl_shader_manager.cpp +++ b/src/video_core/renderer_opengl/gl_shader_manager.cpp @@ -16,6 +16,17 @@ void MaxwellUniformData::SetFromRegs(const Maxwell3D::State::ShaderStageInfo& sh viewport_flip[0] = regs.viewport_transform[0].scale_x < 0.0 ? -1.0f : 1.0f; viewport_flip[1] = regs.viewport_transform[0].scale_y < 0.0 ? -1.0f : 1.0f; + u32 func = static_cast(regs.alpha_test_func); + // Normalize the gl variants of opCompare to be the same as the normal variants + u32 op_gl_variant_base = static_cast(Tegra::Engines::Maxwell3D::Regs::ComparisonOp::Never); + if (func >= op_gl_variant_base) { + func = func - op_gl_variant_base + 1U; + } + + alpha_test.enabled = regs.alpha_test_enabled; + alpha_test.func = func; + alpha_test.ref = regs.alpha_test_ref; + // We only assign the instance to the first component of the vector, the rest is just padding. instance_id[0] = state.current_instance; diff --git a/src/video_core/renderer_opengl/gl_shader_manager.h b/src/video_core/renderer_opengl/gl_shader_manager.h index b3a191cf2c..36fe1f04ce 100644 --- a/src/video_core/renderer_opengl/gl_shader_manager.h +++ b/src/video_core/renderer_opengl/gl_shader_manager.h @@ -22,8 +22,14 @@ struct MaxwellUniformData { alignas(16) GLvec4 viewport_flip; alignas(16) GLuvec4 instance_id; alignas(16) GLuvec4 flip_stage; + struct alignas(16) { + GLuint enabled; + GLuint func; + GLfloat ref; + GLuint padding; + } alpha_test; }; -static_assert(sizeof(MaxwellUniformData) == 48, "MaxwellUniformData structure size is incorrect"); +static_assert(sizeof(MaxwellUniformData) == 64, "MaxwellUniformData structure size is incorrect"); static_assert(sizeof(MaxwellUniformData) < 16384, "MaxwellUniformData structure must be less than 16kb as per the OpenGL spec");