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[PICA] Alpha test and some new registers

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wheremyfoodat 2022-10-01 02:40:08 +03:00
parent 6adc56df4e
commit 8b85255f4c
6 changed files with 104 additions and 29 deletions
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63
src/core/PICA/renderer_opengl.cpp
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@ -1,7 +1,10 @@
#include "PICA/float_types.hpp"
#include "PICA/gpu.hpp"
#include "PICA/regs.hpp"
#include "opengl.hpp"
using namespace Floats;
// This is all hacked up to display our first triangle
const char* vertexShader = R"(
@ -24,8 +27,46 @@ const char* fragmentShader = R"(
in vec4 colour;
out vec4 fragColour;
uniform uint u_alphaControl;
void main() {
fragColour = colour;
gl_FragDepth *= -1.0;
if ((u_alphaControl & 1u) != 0u) { // Check if alpha test is on
uint func = (u_alphaControl >> 4u) & 7u;
float reference = float((u_alphaControl >> 8u) & 0xffu) / 255.0;
float alpha = fragColour.a;
switch (func) {
case 0: discard; break; // Never pass alpha test
case 1: break; // Always pass alpha test
case 2: // Pass if equal
if (alpha != reference)
discard;
break;
case 3: // Pass if not equal
if (alpha == reference)
discard;
break;
case 4: // Pass if less than
if (alpha >= reference)
discard;
break;
case 5: // Pass if less than or equal
if (alpha > reference)
discard;
break;
case 6: // Pass if greater than
if (alpha <= reference)
discard;
break;
case 7: // Pass if greater than or equal
if (alpha < reference)
discard;
break;
}
}
}
)";
@ -94,6 +135,10 @@ void GPU::initGraphicsContext() {
OpenGL::Shader vert(vertexShader, OpenGL::Vertex);
OpenGL::Shader frag(fragmentShader, OpenGL::Fragment);
triangleProgram.create({ vert, frag });
triangleProgram.use();
alphaControlLoc = OpenGL::uniformLocation(triangleProgram, "u_alphaControl");
glUniform1ui(alphaControlLoc, 0); // Default alpha control to 0
OpenGL::Shader vertDisplay(displayVertexShader, OpenGL::Vertex);
OpenGL::Shader fragDisplay(displayFragmentShader, OpenGL::Fragment);
@ -126,7 +171,13 @@ void GPU::getGraphicsContext() {
}
void GPU::drawVertices(OpenGL::Primitives primType, Vertex* vertices, u32 count) {
// Adjust depth buffer
// Adjust alpha test if necessary
const u32 alphaControl = regs[PICAInternalRegs::AlphaTestConfig];
if (alphaControl != oldAlphaControl) {
oldAlphaControl = alphaControl;
glUniform1ui(alphaControlLoc, alphaControl);
}
const u32 depthControl = regs[PICAInternalRegs::DepthAndColorMask];
bool depthEnable = depthControl & 1;
bool depthWriteEnable = (depthControl >> 12) & 1;
@ -137,8 +188,17 @@ void GPU::drawVertices(OpenGL::Primitives primType, Vertex* vertices, u32 count)
GL_NEVER, GL_ALWAYS, GL_EQUAL, GL_NOTEQUAL, GL_LESS, GL_LEQUAL, GL_GREATER, GL_GEQUAL
};
f24 depthScale = f24::fromRaw(regs[PICAInternalRegs::DepthScale] & 0xffffff);
f24 depthOffset = f24::fromRaw(regs[PICAInternalRegs::DepthOffset] & 0xffffff);
printf("Depth enable: %d, func: %d, writeEnable: %d\n", depthEnable, depthFunc, depthWriteEnable);
if (depthScale.toFloat32() != -1.0 || depthOffset.toFloat32() != 0.0)
Helpers::panic("TODO: Implement depth scale/offset. Remove the depth *= -1.0 from fragment shader");
// TODO: Actually use this
float viewportWidth = f24::fromRaw(regs[PICAInternalRegs::ViewportWidth] & 0xffffff).toFloat32() * 2.0;
float viewportHeight = f24::fromRaw(regs[PICAInternalRegs::ViewportHeight] & 0xffffff).toFloat32() * 2.0;
if (depthEnable) {
OpenGL::enableDepth();
glDepthFunc(depthModes[depthFunc]);
@ -153,7 +213,6 @@ void GPU::drawVertices(OpenGL::Primitives primType, Vertex* vertices, u32 count)
}
if (colourMask != 0xf) Helpers::panic("[PICA] Colour mask = %X != 0xf", colourMask);
vbo.bufferVertsSub(vertices, count);
OpenGL::draw(primType, count);
}