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[OpenGL renderer] Fewer uniform uploads

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wheremyfoodat 2023-07-05 01:02:32 +03:00
parent 3e18281a99
commit c282a44c27
2 changed files with 18 additions and 43 deletions
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5
include/renderer_gl/renderer_gl.hpp
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@ -23,8 +23,6 @@ class Renderer {
OpenGL::VertexArray vao;
OpenGL::VertexBuffer vbo;
GLint alphaControlLoc = -1;
GLint texUnitConfigLoc = -1;
// TEV configuration uniform locations
GLint textureEnvSourceLoc = -1;
@ -41,9 +39,6 @@ class Renderer {
GLint depthScaleLoc = -1;
GLint depthmapEnableLoc = -1;
u32 oldAlphaControl = 0;
u32 oldTexUnitConfig = 0;
float oldDepthScale = -1.0;
float oldDepthOffset = 0.0;
bool oldDepthmapEnable = false;

56
src/core/renderer_gl/renderer_gl.cpp
View file

@ -35,11 +35,11 @@ const char* vertexShader = R"(
// TEV uniforms
uniform uint u_textureEnvColor[6];
uniform uint u_textureEnvBufferColor;
uniform uint u_picaRegs[0x200 - 0x47];
uniform uint u_picaRegs[0x200 - 0x48];
// Helper so that the implementation of u_pica_regs can be changed later
uint readPicaReg(uint reg_addr){
return u_picaRegs[reg_addr - 0x47];
return u_picaRegs[reg_addr - 0x48];
}
vec4 abgr8888ToVec4(uint abgr) {
@ -131,9 +131,6 @@ const char* fragmentShader = R"(
out vec4 fragColour;
uniform uint u_alphaControl;
uniform uint u_textureConfig;
// TEV uniforms
uniform uint u_textureEnvSource[6];
uniform uint u_textureEnvOperand[6];
@ -151,11 +148,11 @@ const char* fragmentShader = R"(
uniform sampler2D u_tex2;
uniform sampler1DArray u_tex_lighting_lut;
uniform uint u_picaRegs[0x200 - 0x47];
uniform uint u_picaRegs[0x200 - 0x48];
// Helper so that the implementation of u_pica_regs can be changed later
uint readPicaReg(uint reg_addr){
return u_picaRegs[reg_addr - 0x47];
return u_picaRegs[reg_addr - 0x48];
}
vec4 tevSources[16];
@ -453,16 +450,17 @@ const char* fragmentShader = R"(
}
void main() {
vec2 tex2UV = (u_textureConfig & (1u << 13)) != 0u ? v_texcoord1 : v_texcoord2;
// TODO: what do invalid sources and disabled textures read as?
// And what does the "previous combiner" source read initially?
tevSources[0] = v_colour; // Primary/vertex color
calcLighting(tevSources[1],tevSources[2]);
if ((u_textureConfig & 1u) != 0u) tevSources[3] = texture(u_tex0, v_texcoord0.xy);
if ((u_textureConfig & 2u) != 0u) tevSources[4] = texture(u_tex1, v_texcoord1);
if ((u_textureConfig & 4u) != 0u) tevSources[5] = texture(u_tex2, tex2UV);
uint textureConfig = readPicaReg(0x80);
vec2 tex2UV = (textureConfig & (1u << 13)) != 0u ? v_texcoord1 : v_texcoord2;
if ((textureConfig & 1u) != 0u) tevSources[3] = texture(u_tex0, v_texcoord0.xy);
if ((textureConfig & 2u) != 0u) tevSources[4] = texture(u_tex1, v_texcoord1);
if ((textureConfig & 4u) != 0u) tevSources[5] = texture(u_tex2, tex2UV);
tevSources[13] = vec4(0.0); // Previous buffer
tevSources[15] = vec4(0.0); // Previous combiner
@ -503,9 +501,11 @@ const char* fragmentShader = R"(
// Write final fragment depth
gl_FragDepth = depth;
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;
// Perform alpha test
uint alphaControl = readPicaReg(0x104);
if ((alphaControl & 1u) != 0u) { // Check if alpha test is on
uint func = (alphaControl >> 4u) & 7u;
float reference = float((alphaControl >> 8u) & 0xffu) / 255.0;
float alpha = fragColour.a;
switch (func) {
@ -593,15 +593,11 @@ void Renderer::reset() {
const auto oldProgram = OpenGL::getProgram();
gl.useProgram(triangleProgram);
oldAlphaControl = 0; // Default alpha control to 0
oldTexUnitConfig = 0; // Default tex unit config to 0
oldDepthScale = -1.0; // Default depth scale to -1.0, which is what games typically use
oldDepthOffset = 0.0; // Default depth offset to 0
oldDepthmapEnable = false; // Enable w buffering
glUniform1ui(alphaControlLoc, oldAlphaControl);
glUniform1ui(texUnitConfigLoc, oldTexUnitConfig);
glUniform1f(depthScaleLoc, oldDepthScale);
glUniform1f(depthOffsetLoc, oldDepthOffset);
glUniform1i(depthmapEnableLoc, oldDepthmapEnable);
@ -615,9 +611,6 @@ void Renderer::initGraphicsContext() {
OpenGL::Shader frag(fragmentShader, OpenGL::Fragment);
triangleProgram.create({ vert, frag });
gl.useProgram(triangleProgram);
alphaControlLoc = OpenGL::uniformLocation(triangleProgram, "u_alphaControl");
texUnitConfigLoc = OpenGL::uniformLocation(triangleProgram, "u_textureConfig");
textureEnvSourceLoc = OpenGL::uniformLocation(triangleProgram, "u_textureEnvSource");
textureEnvOperandLoc = OpenGL::uniformLocation(triangleProgram, "u_textureEnvOperand");
@ -815,14 +808,8 @@ void Renderer::bindTexturesToSlots() {
glActiveTexture(GL_TEXTURE0 + 3);
glBindTexture(GL_TEXTURE_1D_ARRAY, lightLUTTextureArray);
glActiveTexture(GL_TEXTURE0);
// Update the texture unit configuration uniform if it changed
const u32 texUnitConfig = regs[PICA::InternalRegs::TexUnitCfg];
if (oldTexUnitConfig != texUnitConfig) {
oldTexUnitConfig = texUnitConfig;
glUniform1ui(texUnitConfigLoc, texUnitConfig);
}
}
void Renderer::updateLightingLUT(){
std::array<u16, GPU::LightingLutSize> u16_lightinglut;
@ -854,13 +841,6 @@ void Renderer::drawVertices(PICA::PrimType primType, std::span<const Vertex> ver
gl.bindVAO(vao);
gl.useProgram(triangleProgram);
// Adjust alpha test if necessary
const u32 alphaControl = regs[PICA::InternalRegs::AlphaTestConfig];
if (alphaControl != oldAlphaControl) {
oldAlphaControl = alphaControl;
glUniform1ui(alphaControlLoc, alphaControl);
}
OpenGL::enableClipPlane(0); // Clipping plane 0 is always enabled
if (regs[PICA::InternalRegs::ClipEnable] & 1) {
OpenGL::enableClipPlane(1);
@ -904,9 +884,9 @@ void Renderer::drawVertices(PICA::PrimType primType, std::span<const Vertex> ver
setupTextureEnvState();
bindTexturesToSlots();
// Upload PICA Registers as a single uniform. The shader needs access to the rasterizer registers (for depth, starting from index 0x47)
// Upload PICA Registers as a single uniform. The shader needs access to the rasterizer registers (for depth, starting from index 0x48)
// The texturing and the fragment lighting registers. Therefore we upload them all in one go to avoid multiple slow uniform updates
glUniform1uiv(picaRegLoc, 0x200 - 0x47, &regs[0x47]);
glUniform1uiv(picaRegLoc, 0x200 - 0x48, &regs[0x48]);
if (gpu.lightingLUTDirty) {
updateLightingLUT();