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RenderCopyEx,rotation and flipping for all hardware/software backends (#1308)

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This commit is contained in:
Gabriel Jacobo 2012-06-01 19:51:08 -03:00
parent 5791b11bc4
commit 17bdcc6e8e
14 changed files with 1550 additions and 10 deletions
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94
src/render/opengl/SDL_render_gl.c
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@ -65,6 +65,9 @@ static int GL_RenderFillRects(SDL_Renderer * renderer,
const SDL_Rect * rects, int count);
static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_Rect * dstrect);
static int GL_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_Rect * dstrect,
const double angle, const SDL_Point *center, const SDL_RendererFlip flip);
static int GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 pixel_format, void * pixels, int pitch);
static void GL_RenderPresent(SDL_Renderer * renderer);
@ -314,6 +317,7 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
renderer->RenderDrawLines = GL_RenderDrawLines;
renderer->RenderFillRects = GL_RenderFillRects;
renderer->RenderCopy = GL_RenderCopy;
renderer->RenderCopyEx = GL_RenderCopyEx;
renderer->RenderReadPixels = GL_RenderReadPixels;
renderer->RenderPresent = GL_RenderPresent;
renderer->DestroyTexture = GL_DestroyTexture;
@ -1018,6 +1022,96 @@ GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
return 0;
}
static int
GL_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_Rect * dstrect,
const double angle, const SDL_Point *center, const SDL_RendererFlip flip)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
GL_TextureData *texturedata = (GL_TextureData *) texture->driverdata;
GLfloat minx, miny, maxx, maxy;
GLfloat centerx, centery;
GLfloat minu, maxu, minv, maxv;
GL_ActivateRenderer(renderer);
data->glEnable(texturedata->type);
if (texturedata->yuv) {
data->glActiveTextureARB(GL_TEXTURE2_ARB);
data->glBindTexture(texturedata->type, texturedata->vtexture);
data->glActiveTextureARB(GL_TEXTURE1_ARB);
data->glBindTexture(texturedata->type, texturedata->utexture);
data->glActiveTextureARB(GL_TEXTURE0_ARB);
}
data->glBindTexture(texturedata->type, texturedata->texture);
if (texture->modMode) {
GL_SetColor(data, texture->r, texture->g, texture->b, texture->a);
} else {
GL_SetColor(data, 255, 255, 255, 255);
}
GL_SetBlendMode(data, texture->blendMode);
if (texturedata->yuv) {
GL_SetShader(data, SHADER_YV12);
} else {
GL_SetShader(data, SHADER_RGB);
}
centerx = (GLfloat)center->x;
centery = (GLfloat)center->y;
if (flip & SDL_FLIP_HORIZONTAL) {
minx = (GLfloat) dstrect->w - centerx;
maxx = -centerx;
}
else {
minx = -centerx;
maxx = (GLfloat) dstrect->w - centerx;
}
if (flip & SDL_FLIP_VERTICAL) {
miny = (GLfloat) dstrect->h - centery;
maxy = -centery;
}
else {
miny = -centery;
maxy = (GLfloat) dstrect->h - centery;
}
minu = (GLfloat) srcrect->x / texture->w;
minu *= texturedata->texw;
maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;
maxu *= texturedata->texw;
minv = (GLfloat) srcrect->y / texture->h;
minv *= texturedata->texh;
maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;
maxv *= texturedata->texh;
// Translate to flip, rotate, translate to position
data->glPushMatrix();
data->glTranslatef((GLfloat)dstrect->x + centerx, (GLfloat)dstrect->y + centery, (GLfloat)0.0);
data->glRotated(angle, (GLdouble)0.0, (GLdouble)0.0, (GLdouble)1.0);
data->glBegin(GL_TRIANGLE_STRIP);
data->glTexCoord2f(minu, minv);
data->glVertex2f(minx, miny);
data->glTexCoord2f(maxu, minv);
data->glVertex2f(maxx, miny);
data->glTexCoord2f(minu, maxv);
data->glVertex2f(minx, maxy);
data->glTexCoord2f(maxu, maxv);
data->glVertex2f(maxx, maxy);
data->glEnd();
data->glPopMatrix();
data->glDisable(texturedata->type);
return 0;
}
static int
GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 pixel_format, void * pixels, int pitch)