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PICA: Implement scissor test

This commit is contained in:
Subv 2015-12-02 13:23:51 -05:00 committed by Yuri Kunde Schlesner
parent 9cde5cbbd3
commit f9be06b15f
5 changed files with 105 additions and 3 deletions
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32
src/video_core/pica.h
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@ -115,7 +115,36 @@ struct Regs {
BitField<24, 5, Semantic> map_w;
} vs_output_attributes[7];
INSERT_PADDING_WORDS(0x11);
INSERT_PADDING_WORDS(0xe);
enum class ScissorMode : u32 {
Disabled = 0,
Exclude = 1, // Exclude pixels inside the scissor box
Include = 3 // Exclude pixels outside the scissor box
};
struct {
BitField<0, 2, ScissorMode> mode;
union {
BitField< 0, 16, u32> right;
BitField<16, 16, u32> bottom;
};
union {
BitField< 0, 16, u32> left_minus_1;
BitField<16, 16, u32> top_minus_1;
};
u32 GetTop() const {
return top_minus_1 + 1;
}
u32 GetLeft() const {
return left_minus_1 + 1;
}
} scissor_test;
union {
BitField< 0, 10, s32> x;
@ -1328,6 +1357,7 @@ ASSERT_REG_POSITION(viewport_depth_range, 0x4d);
ASSERT_REG_POSITION(viewport_depth_near_plane, 0x4e);
ASSERT_REG_POSITION(vs_output_attributes[0], 0x50);
ASSERT_REG_POSITION(vs_output_attributes[1], 0x51);
ASSERT_REG_POSITION(scissor_test, 0x65);
ASSERT_REG_POSITION(viewport_corner, 0x68);
ASSERT_REG_POSITION(depthmap_enable, 0x6D);
ASSERT_REG_POSITION(texture0_enable, 0x80);

22
src/video_core/rasterizer.cpp
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@ -338,12 +338,25 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
return;
}
// TODO: Proper scissor rect test!
u16 min_x = std::min({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
u16 min_y = std::min({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
u16 max_x = std::max({vtxpos[0].x, vtxpos[1].x, vtxpos[2].x});
u16 max_y = std::max({vtxpos[0].y, vtxpos[1].y, vtxpos[2].y});
// Convert the scissor box coordinates to 12.4 fixed point
u16 scissor_left = (u16)(regs.scissor_test.GetLeft() << 4);
u16 scissor_top = (u16)(regs.scissor_test.GetTop() << 4);
u16 scissor_right = (u16)(regs.scissor_test.right << 4);
u16 scissor_bottom = (u16)(regs.scissor_test.bottom << 4);
if (regs.scissor_test.mode == Regs::ScissorMode::Include) {
// Calculate the new bounds
min_x = std::max(min_x, scissor_right);
min_y = std::max(min_y, scissor_bottom);
max_x = std::min(max_x, scissor_left);
max_y = std::min(max_y, scissor_top);
}
min_x &= Fix12P4::IntMask();
min_y &= Fix12P4::IntMask();
max_x = ((max_x + Fix12P4::FracMask()) & Fix12P4::IntMask());
@ -383,6 +396,13 @@ static void ProcessTriangleInternal(const Shader::OutputVertex& v0,
for (u16 y = min_y + 8; y < max_y; y += 0x10) {
for (u16 x = min_x + 8; x < max_x; x += 0x10) {
// Do not process the pixel if it's inside the scissor box and the scissor mode is set to Exclude
if (regs.scissor_test.mode == Regs::ScissorMode::Exclude &&
x >= scissor_right && x <= scissor_left &&
y >= scissor_bottom && y <= scissor_top) {
continue;
}
// Calculate the barycentric coordinates w0, w1 and w2
int w0 = bias0 + SignedArea(vtxpos[1].xy(), vtxpos[2].xy(), {x, y});
int w1 = bias1 + SignedArea(vtxpos[2].xy(), vtxpos[0].xy(), {x, y});

26
src/video_core/renderer_opengl/gl_rasterizer.cpp
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@ -353,6 +353,15 @@ void RasterizerOpenGL::NotifyPicaRegisterChanged(u32 id) {
SyncColorWriteMask();
break;
// Scissor test
case PICA_REG_INDEX(scissor_test.mode):
shader_dirty = true;
break;
case PICA_REG_INDEX(scissor_test.right):
case PICA_REG_INDEX(scissor_test.left_minus_1):
SyncScissorTest();
break;
// Logic op
case PICA_REG_INDEX(output_merger.logic_op):
SyncLogicOp();
@ -1002,6 +1011,7 @@ void RasterizerOpenGL::SetShader() {
SyncDepthOffset();
SyncAlphaTest();
SyncCombinerColor();
SyncScissorTest();
auto& tev_stages = Pica::g_state.regs.GetTevStages();
for (int index = 0; index < tev_stages.size(); ++index)
SyncTevConstColor(index, tev_stages[index]);
@ -1166,6 +1176,22 @@ void RasterizerOpenGL::SyncDepthTest() {
PicaToGL::CompareFunc(regs.output_merger.depth_test_func) : GL_ALWAYS;
}
void RasterizerOpenGL::SyncScissorTest() {
const auto& regs = Pica::g_state.regs;
if (uniform_block_data.data.scissor_right != regs.scissor_test.right ||
uniform_block_data.data.scissor_bottom != regs.scissor_test.bottom ||
uniform_block_data.data.scissor_left != regs.scissor_test.GetLeft() ||
uniform_block_data.data.scissor_top != regs.scissor_test.GetTop()) {
uniform_block_data.data.scissor_right = regs.scissor_test.right;
uniform_block_data.data.scissor_bottom = regs.scissor_test.bottom;
uniform_block_data.data.scissor_left = regs.scissor_test.GetLeft();
uniform_block_data.data.scissor_top = regs.scissor_test.GetTop();
uniform_block_data.dirty = true;
}
}
void RasterizerOpenGL::SyncCombinerColor() {
auto combiner_color = PicaToGL::ColorRGBA8(Pica::g_state.regs.tev_combiner_buffer_color.raw);
if (combiner_color != uniform_block_data.data.tev_combiner_buffer_color) {

12
src/video_core/renderer_opengl/gl_rasterizer.h
View File

@ -56,6 +56,8 @@ union PicaShaderConfig {
const auto& regs = Pica::g_state.regs;
state.scissor_test_mode = regs.scissor_test.mode;
state.depthmap_enable = regs.depthmap_enable;
state.alpha_test_func = regs.output_merger.alpha_test.enable ?
@ -172,6 +174,7 @@ union PicaShaderConfig {
struct State {
Pica::Regs::CompareFunc alpha_test_func;
Pica::Regs::ScissorMode scissor_test_mode;
Pica::Regs::TextureConfig::TextureType texture0_type;
std::array<TevStageConfigRaw, 6> tev_stages;
u8 combiner_buffer_input;
@ -328,6 +331,10 @@ private:
GLint alphatest_ref;
GLfloat depth_scale;
GLfloat depth_offset;
GLint scissor_right;
GLint scissor_bottom;
GLint scissor_left;
GLint scissor_top;
alignas(16) GLvec3 fog_color;
alignas(16) GLvec3 lighting_global_ambient;
LightSrc light_src[8];
@ -335,7 +342,7 @@ private:
alignas(16) GLvec4 tev_combiner_buffer_color;
};
static_assert(sizeof(UniformData) == 0x3A0, "The size of the UniformData structure has changed, update the structure in the shader");
static_assert(sizeof(UniformData) == 0x3B0, "The size of the UniformData structure has changed, update the structure in the shader");
static_assert(sizeof(UniformData) < 16384, "UniformData structure must be less than 16kb as per the OpenGL spec");
/// Sets the OpenGL shader in accordance with the current PICA register state
@ -384,6 +391,9 @@ private:
/// Syncs the depth test states to match the PICA register
void SyncDepthTest();
/// Syncs the scissor test state to match the PICA register
void SyncScissorTest();
/// Syncs the TEV combiner color buffer to match the PICA register
void SyncCombinerColor();

16
src/video_core/renderer_opengl/gl_shader_gen.cpp
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@ -539,6 +539,8 @@ in float texcoord0_w;
in vec4 normquat;
in vec3 view;
in vec4 gl_FragCoord;
out vec4 color;
struct LightSrc {
@ -555,6 +557,10 @@ layout (std140) uniform shader_data {
int alphatest_ref;
float depth_scale;
float depth_offset;
int scissor_right;
int scissor_bottom;
int scissor_left;
int scissor_top;
vec3 fog_color;
vec3 lighting_global_ambient;
LightSrc light_src[NUM_LIGHTS];
@ -582,6 +588,16 @@ vec4 secondary_fragment_color = vec4(0.0);
return out;
}
// Append the scissor test
if (state.scissor_test_mode == Regs::ScissorMode::Include || state.scissor_test_mode == Regs::ScissorMode::Exclude) {
out += "if (scissor_left <= scissor_right || scissor_top <= scissor_bottom) discard;\n";
out += "if (";
// Negate the condition if we have to keep only the pixels outside the scissor box
if (state.scissor_test_mode == Regs::ScissorMode::Include)
out += "!";
out += "(gl_FragCoord.x >= scissor_right && gl_FragCoord.x <= scissor_left && gl_FragCoord.y >= scissor_bottom && gl_FragCoord.y <= scissor_top)) discard;\n";
}
out += "float z_over_w = 1.0 - gl_FragCoord.z * 2.0;\n";
out += "float depth = z_over_w * depth_scale + depth_offset;\n";
if (state.depthmap_enable == Pica::Regs::DepthBuffering::WBuffering) {