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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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96
src/render/opengles/SDL_render_gles.c
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@ -71,6 +71,9 @@ static int GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * dstrect);
static int GLES_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 pixel_format, void * pixels, int pitch);
static int GLES_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 void GLES_RenderPresent(SDL_Renderer * renderer);
static void GLES_DestroyTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
@ -304,6 +307,7 @@ GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
renderer->RenderFillRects = GLES_RenderFillRects;
renderer->RenderCopy = GLES_RenderCopy;
renderer->RenderReadPixels = GLES_RenderReadPixels;
renderer->RenderCopyEx = GLES_RenderCopyEx;
renderer->RenderPresent = GLES_RenderPresent;
renderer->DestroyTexture = GLES_DestroyTexture;
renderer->DestroyRenderer = GLES_DestroyRenderer;
@ -958,6 +962,98 @@ GLES_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
return status;
}
static int
GLES_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)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
int minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
GLfloat centerx, centery;
GLES_ActivateRenderer(renderer);
data->glEnable(GL_TEXTURE_2D);
data->glBindTexture(texturedata->type, texturedata->texture);
if (texture->modMode) {
GLES_SetColor(data, texture->r, texture->g, texture->b, texture->a);
} else {
GLES_SetColor(data, 255, 255, 255, 255);
}
GLES_SetBlendMode(data, texture->blendMode);
GLES_SetTexCoords(data, SDL_TRUE);
centerx = (GLfloat)center->x;
centery = (GLfloat)center->y;
// Rotate and translate
data->glPushMatrix();
data->glTranslatef((GLfloat)dstrect->x + centerx, (GLfloat)dstrect->y + centery, (GLfloat)0.0);
data->glRotatef((GLfloat)angle, (GLfloat)0.0, (GLfloat)0.0, (GLfloat)1.0);
if (flip & SDL_FLIP_HORIZONTAL) {
minx = (GLfloat) dstrect->w - centerx;
maxx = -centerx;
}
else {
minx = -centerx;
maxx = dstrect->w - centerx;
}
if (flip & SDL_FLIP_VERTICAL) {
miny = dstrect->h - centery;
maxy = -centery;
}
else {
miny = -centery;
maxy = 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;
GLshort vertices[8];
GLfloat texCoords[8];
vertices[0] = minx;
vertices[1] = miny;
vertices[2] = maxx;
vertices[3] = miny;
vertices[4] = minx;
vertices[5] = maxy;
vertices[6] = maxx;
vertices[7] = maxy;
texCoords[0] = minu;
texCoords[1] = minv;
texCoords[2] = maxu;
texCoords[3] = minv;
texCoords[4] = minu;
texCoords[5] = maxv;
texCoords[6] = maxu;
texCoords[7] = maxv;
data->glVertexPointer(2, GL_SHORT, 0, vertices);
data->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
data->glPopMatrix();
data->glDisable(GL_TEXTURE_2D);
return 0;
}
static void
GLES_RenderPresent(SDL_Renderer * renderer)
{