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Implement reading texture from NULL

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wheremyfoodat 2023-08-18 16:19:54 +03:00
parent 0aef0a6426
commit 7bbf37bb63
2 changed files with 31 additions and 4 deletions
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1
include/renderer_gl/renderer_gl.hpp
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@ -55,6 +55,7 @@ class RendererGL final : public Renderer {
OpenGL::Texture screenTexture;
GLuint lightLUTTextureArray;
OpenGL::Framebuffer screenFramebuffer;
OpenGL::Texture blankTexture;
OpenGL::Framebuffer getColourFBO();
OpenGL::Texture getTexture(Texture& tex);

34
src/core/renderer_gl/renderer_gl.cpp
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@ -118,6 +118,7 @@ void RendererGL::initGraphicsContext(SDL_Window* window) {
dummyVBO.create();
dummyVAO.create();
gl.disableScissor();
// Create texture and framebuffer for the 3DS screen
const u32 screenTextureWidth = 400; // Top screen is 400 pixels wide, bottom is 320
@ -126,6 +127,24 @@ void RendererGL::initGraphicsContext(SDL_Window* window) {
glGenTextures(1, &lightLUTTextureArray);
auto prevTexture = OpenGL::getTex2D();
// Create a plain black texture for when a game reads an invalid texture. It is common for games to configure the PICA to read texture info from NULL.
// Some games that do this are Pokemon X, Cars 2, Tomodachi Life, and more. We bind the texture to an FBO, clear it, and free the FBO
blankTexture.create(8, 8, GL_RGBA8);
blankTexture.bind();
blankTexture.setMinFilter(OpenGL::Linear);
blankTexture.setMagFilter(OpenGL::Linear);
OpenGL::Framebuffer dummyFBO;
dummyFBO.createWithDrawTexture(blankTexture); // Create FBO and bind our texture to it
dummyFBO.bind(OpenGL::DrawFramebuffer);
// Clear the texture and then delete FBO
OpenGL::setViewport(8, 8);
gl.setClearColour(0.0, 0.0, 0.0, 1.0);
OpenGL::clearColor();
dummyFBO.free();
screenTexture.create(screenTextureWidth, screenTextureHeight, GL_RGBA8);
screenTexture.bind();
screenTexture.setMinFilter(OpenGL::Linear);
@ -143,7 +162,6 @@ void RendererGL::initGraphicsContext(SDL_Window* window) {
GLint oldViewport[4];
glGetIntegerv(GL_VIEWPORT, oldViewport);
OpenGL::setViewport(screenTextureWidth, screenTextureHeight);
gl.setClearColour(0.0, 0.0, 0.0, 1.0);
OpenGL::clearColor();
OpenGL::setViewport(oldViewport[0], oldViewport[1], oldViewport[2], oldViewport[3]);
@ -321,9 +339,17 @@ void RendererGL::bindTexturesToSlots() {
u32 format = regs[ioBase + (i == 0 ? 13 : 5)] & 0xF;
glActiveTexture(GL_TEXTURE0 + i);
Texture targetTex(addr, static_cast<PICA::TextureFmt>(format), width, height, config);
OpenGL::Texture tex = getTexture(targetTex);
tex.bind();
if (addr != 0) [[likely]] {
Texture targetTex(addr, static_cast<PICA::TextureFmt>(format), width, height, config);
OpenGL::Texture tex = getTexture(targetTex);
tex.bind();
} else {
// Mapping a texture from NULL. PICA seems to read the last sampled colour, but for now we will display a black texture instead since it is far easier.
// Games that do this don't really care what it does, they just expect the PICA to not crash, since it doesn't have a PU/MMU and can do all sorts of
// Weird invalid memory accesses without crashing
blankTexture.bind();
}
}
glActiveTexture(GL_TEXTURE0 + 3);