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renderer_gl: Implement stencil testing

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wheremyfoodat 2023-07-08 14:51:09 +03:00 • committed by GPUCode
parent 037d16ae7c
commit 95a8917589
3 changed files with 59 additions and 1 deletions
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2
include/PICA/regs.hpp
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@ -55,6 +55,8 @@ namespace PICA {
BlendFunc = 0x101,
BlendColour = 0x103,
AlphaTestConfig = 0x104,
StencilTest = 0x105,
StencilOp = 0x106,
DepthAndColorMask = 0x107,
DepthBufferFormat = 0x116,
ColourBufferFormat = 0x117,

3
include/renderer_gl/renderer_gl.hpp
View file

@ -61,6 +61,7 @@ class RendererGL final : public Renderer {
MAKE_LOG_FUNCTION(log, rendererLogger)
void setupBlending();
void setupStencilTest(bool stencilEnable);
void bindDepthBuffer();
void setupTextureEnvState();
void bindTexturesToSlots();
@ -79,4 +80,4 @@ class RendererGL final : public Renderer {
// Take a screenshot of the screen and store it in a file
void screenshot(const std::string& name) override;
};
};

55
src/core/renderer_gl/renderer_gl.cpp
View file

@ -205,6 +205,51 @@ void RendererGL::setupBlending() {
}
}
void RendererGL::setupStencilTest(bool stencilEnable) {
if (!stencilEnable) {
OpenGL::disableStencil();
return;
}
static constexpr std::array<GLenum, 8> stencilFuncs = {
GL_NEVER,
GL_ALWAYS,
GL_EQUAL,
GL_NOTEQUAL,
GL_LESS,
GL_LEQUAL,
GL_GREATER,
GL_GEQUAL
};
OpenGL::enableStencil();
const u32 stencilConfig = regs[PICA::InternalRegs::StencilTest];
const u32 stencilFunc = getBits<4, 3>(stencilConfig);
const u32 stencilBufferMask = getBits<8, 8>(stencilConfig);
const s32 reference = s8(getBits<16, 8>(stencilConfig)); // Signed reference value
const u32 stencilRefMask = getBits<24, 8>(stencilConfig);
glStencilFunc(stencilFuncs[stencilFunc], reference, stencilRefMask);
glStencilMask(stencilBufferMask);
static constexpr std::array<GLenum, 8> stencilOps = {
GL_KEEP,
GL_ZERO,
GL_REPLACE,
GL_INCR,
GL_DECR,
GL_INVERT,
GL_INCR_WRAP,
GL_DECR_WRAP
};
const u32 stencilOpConfig = regs[PICA::InternalRegs::StencilOp];
const u32 stencilFailOp = getBits<0, 3>(stencilOpConfig);
const u32 depthFailOp = getBits<4, 3>(stencilOpConfig);
const u32 passOp = getBits<8, 3>(stencilOpConfig);
glStencilOp(stencilOps[stencilFailOp], stencilOps[depthFailOp], stencilOps[passOp]);
}
void RendererGL::setupTextureEnvState() {
// TODO: Only update uniforms when the TEV config changed. Use an UBO potentially.
@ -356,6 +401,9 @@ void RendererGL::drawVertices(PICA::PrimType primType, std::span<const Vertex> v
GLsizei viewportHeight = GLsizei(f24::fromRaw(regs[PICA::InternalRegs::ViewportHeight] & 0xffffff).toFloat32() * 2.0f);
OpenGL::setViewport(viewportWidth, viewportHeight);
const u32 stencilConfig = regs[PICA::InternalRegs::StencilTest];
const bool stencilEnable = getBit<0>(stencilConfig);
// Note: The code below must execute after we've bound the colour buffer & its framebuffer
// Because it attaches a depth texture to the aforementioned colour buffer
if (depthEnable) {
@ -371,9 +419,15 @@ void RendererGL::drawVertices(PICA::PrimType primType, std::span<const Vertex> v
bindDepthBuffer();
} else {
gl.disableDepth();
if (stencilEnable) {
bindDepthBuffer();
}
}
}
setupStencilTest(stencilEnable);
vbo.bufferVertsSub(vertices);
OpenGL::draw(primitiveTopology, GLsizei(vertices.size()));
}
@ -476,6 +530,7 @@ void RendererGL::displayTransfer(u32 inputAddr, u32 outputAddr, u32 inputSize, u
gl.disableBlend();
gl.disableDepth();
gl.disableScissor();
OpenGL::disableStencil();
gl.setColourMask(true, true, true, true);
gl.useProgram(displayProgram);
gl.bindVAO(dummyVAO);