From a5f32397f9c23fa8644fe195865d6c36685cf866 Mon Sep 17 00:00:00 2001 From: "Steinar H. Gunderson" Date: Thu, 20 Mar 2014 22:51:48 +0100 Subject: [PATCH] Emulate glReadPixels of GL_ALPHA. --- test_util.cpp | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/test_util.cpp b/test_util.cpp index 8f81211..d7e4fed 100644 --- a/test_util.cpp +++ b/test_util.cpp @@ -143,12 +143,16 @@ void EffectChainTester::run(float *out_data, GLenum format, Colorspace color_spa 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) { + if (format == GL_ALPHA) { + for (int i = 0; i < width * height; ++i) { + out_data[i] = temp[i * 4 + 3]; + } + } else if (format == GL_BLUE) { for (int i = 0; i < width * height; ++i) { out_data[i] = temp[i * 4 + 2]; } @@ -180,12 +184,16 @@ void EffectChainTester::run(unsigned char *out_data, GLenum format, Colorspace c 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) { + if (format == GL_ALPHA) { + for (int i = 0; i < width * height; ++i) { + out_data[i] = temp[i * 4 + 3]; + } + } else if (format == GL_BLUE) { for (int i = 0; i < width * height; ++i) { out_data[i] = temp[i * 4 + 2]; } -- 2.39.2