static int
GL_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
int count)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
int i;
GL_SetDrawingState(renderer);
data->glBegin(GL_POINTS);
for (i = 0; i < count; ++i) {
data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
}
data->glEnd();
return 0;
}
static int
GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_Rect * dstrect)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
GL_TextureData *texturedata = (GL_TextureData *) texture->driverdata;
int minx, miny, maxx, maxy;
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);
if (texturedata->scaleMode != data->current.scaleMode) {
data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,
texturedata->scaleMode);
data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,
texturedata->scaleMode);
}
data->glActiveTextureARB(GL_TEXTURE1_ARB);
data->glBindTexture(texturedata->type, texturedata->utexture);
if (texturedata->scaleMode != data->current.scaleMode) {
data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,
texturedata->scaleMode);
data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,
texturedata->scaleMode);
}
data->glActiveTextureARB(GL_TEXTURE0_ARB);
}
data->glBindTexture(texturedata->type, texturedata->texture);
if (texturedata->scaleMode != data->current.scaleMode) {
data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,
texturedata->scaleMode);
data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,
texturedata->scaleMode);
data->current.scaleMode = texturedata->scaleMode;
}
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);
}
minx = dstrect->x;
miny = dstrect->y;
maxx = dstrect->x + dstrect->w;
maxy = dstrect->y + dstrect->h;
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;
data->glBegin(GL_TRIANGLE_STRIP);
data->glTexCoord2f(minu, minv);
data->glVertex2f((GLfloat) minx, (GLfloat) miny);
data->glTexCoord2f(maxu, minv);
data->glVertex2f((GLfloat) maxx, (GLfloat) miny);
data->glTexCoord2f(minu, maxv);
data->glVertex2f((GLfloat) minx, (GLfloat) maxy);
data->glTexCoord2f(maxu, maxv);
data->glVertex2f((GLfloat) maxx, (GLfloat) maxy);
data->glEnd();
data->glDisable(texturedata->type);
return 0;
}
static int
GL_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
int i;
GL_SetDrawingState(renderer);
if (count > 2 &&
points[0].x == points[count-1].x && points[0].y == points[count-1].y) {
data->glBegin(GL_LINE_LOOP);
/* GL_LINE_LOOP takes care of the final segment */
--count;
for (i = 0; i < count; ++i) {
data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
}
data->glEnd();
} else {
#if defined(__APPLE__) || defined(__WIN32__)
#else
int x1, y1, x2, y2;
#endif
data->glBegin(GL_LINE_STRIP);
for (i = 0; i < count; ++i) {
data->glVertex2f(0.5f + points[i].x, 0.5f + points[i].y);
}
data->glEnd();
/* The line is half open, so we need one more point to complete it.
* http://www.opengl.org/documentation/specs/version1.1/glspec1.1/node47.html
* If we have to, we can use vertical line and horizontal line textures
* for vertical and horizontal lines, and then create custom textures
* for diagonal lines and software render those. It's terrible, but at
* least it would be pixel perfect.
*/
data->glBegin(GL_POINTS);
#if defined(__APPLE__) || defined(__WIN32__)
/* Mac OS X and Windows seem to always leave the second point open */
data->glVertex2f(0.5f + points[count-1].x, 0.5f + points[count-1].y);
#else
/* Linux seems to leave the right-most or bottom-most point open */
x1 = points[0].x;
y1 = points[0].y;
x2 = points[count-1].x;
y2 = points[count-1].y;
if (x1 > x2) {
data->glVertex2f(0.5f + x1, 0.5f + y1);
} else if (x2 > x1) {
data->glVertex2f(0.5f + x2, 0.5f + y2);
} else if (y1 > y2) {
data->glVertex2f(0.5f + x1, 0.5f + y1);
} else if (y2 > y1) {
data->glVertex2f(0.5f + x2, 0.5f + y2);
}
#endif
data->glEnd();
}
return 0;
}