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[Feat] (ShittilyDrawing): Implement DrawBuffer. Ensure read fbo is bound.

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This commit is contained in:
BZLZHH
2025-05-17 01:25:13 +08:00
parent 4673007708
commit 4316d4e13d
3 changed files with 47 additions and 3 deletions
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MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.cpp
+45 -2
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@@ -23,7 +23,7 @@ namespace MG_GL::GL {
if (outFormat)
*outFormat = format;
break;
case GL_DEPTH_COMPONENT24:
if (outInternalFormat)
*outInternalFormat = internalFormat;
@@ -646,7 +646,7 @@ namespace MG_GL::GL {
}
static GLuint lastBoundProgram = 0;
static GLuint lastBoundFBO[2] = {0};
static GLuint lastBoundFBO[2] = {0}; // 0: DRAW FBO, 1: READ FBO
static std::array<GLuint, 32> lastBoundTextures;
void RealizeFBOState(GLenum fbtype) {
@@ -1026,6 +1026,7 @@ namespace MG_GL::GL {
// Framebuffer
RealizeFBOState(GL_DRAW_FRAMEBUFFER);
RealizeFBOState(GL_READ_FRAMEBUFFER);
}
void DrawArraysSHITTILY(GLenum mode, GLint first, GLsizei count) {
@@ -1109,6 +1110,7 @@ namespace MG_GL::GL {
SyncAllTexturesToGLES(textureState);
RealizeFBOState(GL_DRAW_FRAMEBUFFER);
RealizeFBOState(GL_READ_FRAMEBUFFER);
static GLfloat lastClearColor[4] = {-1.0f, -1.0f, -1.0f, -1.0f};
if (memcmp(lastClearColor, commonState->clearColor, sizeof(lastClearColor)) != 0) {
@@ -1227,4 +1229,45 @@ namespace MG_GL::GL {
}
}
}
void DrawBuffer(GLenum buf) {
SyncAllToGLES();
RealizeFBOState(GL_READ_FRAMEBUFFER);
RealizeFBOState(GL_READ_FRAMEBUFFER);
GLint currentFBO;
CallAndCheck(::GLES::glGetIntegerv(GL_FRAMEBUFFER_BINDING, &currentFBO);)
if (currentFBO == 0) {
GLenum buffers[1] = {GL_NONE};
switch (buf) {
case GL_FRONT:
case GL_BACK:
case GL_NONE:
buffers[0] = buf;
CallAndCheck(::GLES::glDrawBuffers(1, buffers);)
break;
default:
break;
}
} else {
GLint maxAttachments;
CallAndCheck(::GLES::glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &maxAttachments);)
if (buf == GL_NONE) {
auto *buffers = (GLenum *)alloca(maxAttachments * sizeof(GLenum));
for (int i = 0; i < maxAttachments; i++) {
buffers[i] = GL_NONE;
}
CallAndCheck(::GLES::glDrawBuffers(maxAttachments, buffers);)
} else if (buf >= GL_COLOR_ATTACHMENT0 &&
buf < GL_COLOR_ATTACHMENT0 + maxAttachments) {
auto *buffers = (GLenum *)alloca(maxAttachments * sizeof(GLenum));
for (int i = 0; i < maxAttachments; i++) {
buffers[i] = (i == (buf - GL_COLOR_ATTACHMENT0)) ? buf : GL_NONE;
}
CallAndCheck(::GLES::glDrawBuffers(maxAttachments, buffers);)
}
}
}
}