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Improve oslLockImage and oslUnlockImage functions for clarity and readability #51

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Sep 1, 2024
Merged

Improve oslLockImage and oslUnlockImage functions for clarity and readability #51

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120 changes: 75 additions & 45 deletions src/image/oslLockImage.c
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Original file line number Diff line number Diff line change
@@ -1,56 +1,86 @@
#include "oslib.h"

/*
Fonctions sp�ciales PC
Permet d'acc�der en soft � une image s�lectionn�e comme drawbuffer ou texture
Special PC Functions
Allows access to an image selected as a draw buffer or texture
*/
void oslLockImage(OSL_IMAGE *img)
{
//Drawbuffer courant?
if (img == osl_curBuf) {
oslSyncDrawing();
//Avec OpenGL, il faut copier le contenu du drawbuffer sur l'image (vu qu'on va l'utiliser)
#ifndef PSP
//On doit d�sactiver (temporairement) le texturage 2D
int bTextureEnabled = glIsEnabled(GL_TEXTURE_2D), bBlendingEnabled = glIsEnabled(GL_BLEND);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
//Lit les donn�es du backbuffer dans l'image utilis�e jusque l� comme drawbuffer
emuGlReadPixels(0, 272-osl_curBuf->sizeY, osl_curBuf->sysSizeX, osl_curBuf->sizeY, GL_RGBA, osl_curBuf->pixelFormat, osl_curBuf->data);
//R�active si jamais
if (bTextureEnabled)
glEnable(GL_TEXTURE_2D);
if (bBlendingEnabled)
glEnable(GL_BLEND);
#endif
}
// Check if the image is the current draw buffer
if (img == osl_curBuf) {
// Synchronize drawing before accessing the draw buffer
oslSyncDrawing();

#ifndef PSP
// On non-PSP platforms, copy the contents of the draw buffer to the image
int textureEnabled = glIsEnabled(GL_TEXTURE_2D);
int blendingEnabled = glIsEnabled(GL_BLEND);

// Temporarily disable 2D texturing and blending
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);

// Read the pixels from the back buffer into the image data
emuGlReadPixels(
0,
272 - osl_curBuf->sizeY,
osl_curBuf->sysSizeX,
osl_curBuf->sizeY,
GL_RGBA,
osl_curBuf->pixelFormat,
osl_curBuf->data
);

// Re-enable texturing and blending if they were previously enabled
if (textureEnabled) {
glEnable(GL_TEXTURE_2D);
}
if (blendingEnabled) {
glEnable(GL_BLEND);
}
#endif
}
}

//A appeler une fois termin�
// Call this function once the image operations are complete
void oslUnlockImage(OSL_IMAGE *img)
{
// if (img->location == OSL_IN_RAM)
oslUncacheImage(img);
//Texture courante?
if (img->data == osl_curTexture)
osl_curTexture = NULL;
//Avec OpenGL, on recopie le contenu de l'image (modifi�e) vers le framebuffer
#ifndef PSP
if (img == osl_curBuf) {
//On doit d�sactiver (temporairement) le texturage 2D
int bTextureEnabled = glIsEnabled(GL_TEXTURE_2D), bBlendingEnabled = glIsEnabled(GL_BLEND);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
//Lit les donn�es du backbuffer dans l'image utilis�e jusque l� comme drawbuffer
glRasterPos2i(0, 0);
glPixelZoom(1, -1);
glDrawPixels(img->sysSizeX, img->sizeY, GL_RGBA, emu_pixelPhysFormats[img->pixelFormat], img->data);
//R�active si jamais
if (bTextureEnabled)
glEnable(GL_TEXTURE_2D);
if (bBlendingEnabled)
glEnable(GL_BLEND);
}
#endif
}
// Uncache the image if it is stored in RAM
oslUncacheImage(img);

// Check if the image is the current texture
if (img->data == osl_curTexture) {
osl_curTexture = NULL;
}

#ifndef PSP
// On non-PSP platforms, copy the modified image data back to the framebuffer
if (img == osl_curBuf) {
int textureEnabled = glIsEnabled(GL_TEXTURE_2D);
int blendingEnabled = glIsEnabled(GL_BLEND);

// Temporarily disable 2D texturing and blending
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);

// Write the image data back to the framebuffer
glRasterPos2i(0, 0);
glPixelZoom(1, -1);
glDrawPixels(
img->sysSizeX,
img->sizeY,
GL_RGBA,
emu_pixelPhysFormats[img->pixelFormat],
img->data
);

// Re-enable texturing and blending if they were previously enabled
if (textureEnabled) {
glEnable(GL_TEXTURE_2D);
}
if (blendingEnabled) {
glEnable(GL_BLEND);
}
}
#endif
}