glBindFramebuffer(GL_FRAMEBUFFER, fbo);
check_error();
- if (!epoxy_is_desktop_gl() && (format == GL_RED || format == GL_BLUE)) {
+ if (!epoxy_is_desktop_gl() && (format == GL_RED || format == GL_BLUE || format == GL_ALPHA)) {
// GLES will only read GL_RGBA.
float *temp = new float[width * height * 4];
glReadPixels(0, 0, width, height, GL_RGBA, GL_FLOAT, temp);
check_error();
- if (format == GL_BLUE) {
- for (int i = 0; i < width * height; ++i) {
+ if (format == GL_ALPHA) {
+ for (unsigned i = 0; i < width * height; ++i) {
+ out_data[i] = temp[i * 4 + 3];
+ }
+ } else if (format == GL_BLUE) {
+ for (unsigned i = 0; i < width * height; ++i) {
out_data[i] = temp[i * 4 + 2];
}
} else {
- for (int i = 0; i < width * height; ++i) {
+ for (unsigned i = 0; i < width * height; ++i) {
out_data[i] = temp[i * 4];
}
}
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
check_error();
- if (!epoxy_is_desktop_gl() && (format == GL_RED || format == GL_BLUE)) {
+ if (!epoxy_is_desktop_gl() && (format == GL_RED || format == GL_BLUE || format == GL_ALPHA)) {
// GLES will only read GL_RGBA.
unsigned char *temp = new unsigned char[width * height * 4];
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, temp);
check_error();
- if (format == GL_BLUE) {
- for (int i = 0; i < width * height; ++i) {
+ if (format == GL_ALPHA) {
+ for (unsigned i = 0; i < width * height; ++i) {
+ out_data[i] = temp[i * 4 + 3];
+ }
+ } else if (format == GL_BLUE) {
+ for (unsigned i = 0; i < width * height; ++i) {
out_data[i] = temp[i * 4 + 2];
}
} else {
- for (int i = 0; i < width * height; ++i) {
+ for (unsigned i = 0; i < width * height; ++i) {
out_data[i] = temp[i * 4];
}
}