+ * Copyright © 2010 Intel Corporation
+ * Copyright © 2010 Marek Olšák <mar...@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Eric Anholt <e...@anholt.net>
+ * Marek Olšák <mar...@gmail.com>
+ * Roland Scheidegger <srol...@vmware.com>
+ *
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 30;
+
+ /* Drivers that do not support GL_ARB_texture_non_power_of_two require
+ * window dimensions that are powers of two for this test.
+ */
+ config.window_width = next_power_of_two(config.window_width);
+ config.window_height = next_power_of_two(config.window_height);
+
+ config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
+ config.khr_no_error_support = PIGLIT_NO_ERRORS;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static void blend(const float *rect, const float *src, const float *dst, const
float *blendcol,
+ GLenum blendsrc, GLenum blenddst)
+{
+ glColor4fv(dst);
+ piglit_draw_rect(rect[0], rect[1], rect[2], rect[3]);
+ glEnable(GL_BLEND);
+ glBlendFunc(blendsrc, blenddst);
+ if (blendcol)
+ glBlendColor(blendcol[0], blendcol[1], blendcol[2],
blendcol[3]);
+ glColor4fv(src);
+ piglit_draw_rect(rect[0], rect[1], rect[2], rect[3]);
+ glDisable(GL_BLEND);
+}
+
+
+static int
+get_texture_bits(GLenum target, GLenum size_enum, GLenum type_enum)
+{
+ GLint size = 0;
+ GLint type = GL_NONE;
+ glGetTexLevelParameteriv(target, 0, size_enum, &size);
+ if (!size) {
+ return size;
+ }
+ if (piglit_is_extension_supported("GL_EXT_texture_snorm") ||
+ piglit_get_gl_version() >= 31) {
+ glGetTexLevelParameteriv(target, 0, type_enum, &type);
+ if (type == GL_SIGNED_NORMALIZED) {
+ /* One bit is lost for the sign */
+ size -= 1;
+ }
+ }
+ return size;
+}
+
+
+float
+calc_blend_factor(float src, float dst, float blendcol, GLenum factor)
+{
+ switch (factor) {
+ case GL_ZERO:
+ return 0.0f;
+ case GL_ONE:
+ return 1.0f;
+ case GL_SRC_COLOR:
+ return src;
+ case GL_ONE_MINUS_SRC_COLOR:
+ return 1.0f - src;
+ case GL_DST_COLOR:
+ return dst;
+ case GL_ONE_MINUS_DST_COLOR:
+ return 1.0f - dst;
+ case GL_CONSTANT_COLOR:
+ return blendcol;
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ return 1.0f - blendcol;
+ default:
+ assert(0);
+ }
+ return 0.0f;
+}
+
+/*
+ * Calculate add blend func result. Pretty simplified, no separate a/rgb
factors.
+ */
+void
+blend_func_add(const float *src, const float *dst, const float *blendcol,
+ GLenum src_factor, GLenum dst_factor, float *res)
+{
+ int i;
+ for (i = 0; i < 4; i++) {
+ float src_clamped = CLAMP(src[i], -1.0f, 1.0f);
+ float dst_clamped = CLAMP(dst[i], -1.0f, 1.0f);
+ float blendcol_clamped = 0.0f;
+ float res_unclamped, s_factor, d_factor;
+ if (blendcol)
+ blendcol_clamped = CLAMP(blendcol[i], -1.0f, 1.0f);
+ s_factor = calc_blend_factor(src_clamped, dst_clamped,
+ blendcol_clamped, src_factor);
+ d_factor = calc_blend_factor(src_clamped, dst_clamped,
+ blendcol_clamped, dst_factor);
+ res_unclamped = s_factor * src_clamped + d_factor * dst_clamped;
+ res[i] = CLAMP(res_unclamped, -1.0f, 1.0f);
+ }
+}
+
+
+enum piglit_result piglit_display(void)
+{
+ GLboolean pass = GL_TRUE;
+ GLuint tex, fb;
+ GLenum status;
+ int r, g, b, a;
+ struct blend_config {
+ GLenum src_factor;
+ GLenum dst_factor;
+ };
+
+ float res0[] = { 0.3, -0.3, 0.3, 0.0};
+
+ float pos1[] = {-0.66, -1.0, 0.33, 2.0};
+ float dst1[] = { 0.5, 0.4, -0.6, 0.2};
+ float src1[] = { -0.2, 1.9, 0.8, -0.7};
+ struct blend_config cnf1 = {GL_ONE_MINUS_SRC_COLOR, GL_ONE};
+ float res1[4];
+
+ float pos2[] = {-0.33, -1.0, 0.33, 2.0};
+ float dst2[] = {1.9, -0.4, 0.7, 0.5};
+ float src2[] = {-1.8, 0.3, 0.5, 0.9};
+ struct blend_config cnf2 = {GL_DST_COLOR, GL_ONE_MINUS_DST_COLOR};
+ float res2[4];
+
+ float pos3[] = {0.0, -1.0, 0.33, 2.0};
+ float dst3[] = {-0.6, 0.4, 0.8, 0.5};
+ float src3[] = {0.8, 0.9, -0.7, 0.8};
+ struct blend_config cnf3 = {GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR};
+ float res3[4];
+
+ float pos4[] = {0.33, -1.0, 0.33, 2.0};
+ float dst4[] = {0.9, 0.4, 0.7, 0.5};
+ float src4[] = {0.8, 0.3, 0.5, -0.9};
+ struct blend_config cnf4 = {GL_SRC_COLOR, GL_SRC_COLOR};
+ float res4[4];
+
+ float pos5[] = {0.66, -1.0, 0.33, 2.0};
+ float dst5[] = {0.6, -0.3, 0.8, 0.5};
+ float src5[] = {0.8, 0.1, 0.7, 0.8};
+ float con5[] = {1.2, -1.8, 0.4, 0.6};
+ struct blend_config cnf5 = {GL_ONE_MINUS_CONSTANT_COLOR,
GL_ONE_MINUS_DST_COLOR};
+ float res5[4];
+
+ glGenFramebuffersEXT(1, &fb);
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
+ glViewport(0, 0, piglit_width, piglit_height);
+
+ glGenTextures(1, &tex);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8_SNORM,
+ piglit_width, piglit_height, 0,
+ GL_RGBA, GL_FLOAT, NULL);
+
+ a = get_texture_bits(GL_TEXTURE_2D,
+ GL_TEXTURE_ALPHA_SIZE,
+ GL_TEXTURE_ALPHA_TYPE);
+ r = get_texture_bits(GL_TEXTURE_2D,
+ GL_TEXTURE_RED_SIZE,
+ GL_TEXTURE_RED_TYPE);
+ g = get_texture_bits(GL_TEXTURE_2D,
+ GL_TEXTURE_GREEN_SIZE,
+ GL_TEXTURE_GREEN_TYPE);
+ b = get_texture_bits(GL_TEXTURE_2D,
+ GL_TEXTURE_BLUE_SIZE,
+ GL_TEXTURE_BLUE_TYPE);
+
+ {
+ if (!r) {
+ res0[0] = 0;
+ res1[0] = 0;
+ res2[0] = 0;
+ res3[0] = 0;
+ res4[0] = 0;
+ res5[0] = 0;
+ }
+ if (!g) {
+ res0[1] = 0;
+ res1[1] = 0;
+ res2[1] = 0;
+ res3[1] = 0;
+ res4[1] = 0;
+ res5[1] = 0;
+ }
+ if (!b) {
+ res0[2] = 0;
+ res1[2] = 0;
+ res2[2] = 0;
+ res3[2] = 0;
+ res4[2] = 0;
+ res5[2] = 0;
+ }
+ if (!a) {
+ /* When there are no bits for the alpha channel, we
+ * always expect to read an alpha value of 1.0.
+ */
+ res0[3] = 1;
+ res1[3] = 1;
+ res2[3] = 1;
+ res3[3] = 1;
+ res4[3] = 1;
+ res5[3] = 1;
+
+ /* Also blending with
+ * DST_ALPHA/ONE_MINUS_DST_ALPHA (as in case
+ * 4) with an implicit destination alpha value
+ * of 1.0 means that the result color should
+ * be identical to the source color, (if there
+ * are any bits to store that color that is).
+ */
+ if (r) {
+ res4[0] = src4[0];
+ }
+ if (g) {
+ res4[1] = src4[1];
+ }
+ if (b) {
+ res4[2] = src4[2];
+ }
+ }
+ }
+
+ /* Clamp the bits for the framebuffer, except we aren't checking
+ * the actual framebuffer bits.
+ */
+ if (r > 8)
+ r = 8;
+ if (g > 8)
+ g = 8;
+ if (b > 8)
+ b = 8;
+ if (a > 8)
+ a = 8;
+
+ piglit_set_tolerance_for_bits(r, g, b, a);
+
+ glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
+ GL_COLOR_ATTACHMENT0_EXT,
+ GL_TEXTURE_2D,
+ tex,
+ 0);
+ if (!piglit_check_gl_error(GL_NO_ERROR))
+ piglit_report_result(PIGLIT_FAIL);
+
+ status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+ if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+ printf(" - fbo incomplete (status = %s)\n",
+ piglit_get_gl_enum_name(status));
+ piglit_report_subtest_result(PIGLIT_SKIP, "%s",
"GL_RGBA8_SNORM");
+ return PIGLIT_SKIP;
+ }
+ printf("\n");
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glColor4fv(res0);
+ piglit_draw_rect(-1.0, -1.0, 0.33, 2.0);
+
+ blend(pos1, src1, dst1, NULL, cnf1.src_factor, cnf1.dst_factor);
+ blend(pos2, src2, dst2, NULL, cnf2.src_factor, cnf2.dst_factor);
+ blend(pos3, src3, dst3, NULL, cnf3.src_factor, cnf3.dst_factor);
+ blend(pos4, src4, dst4, NULL, cnf4.src_factor, cnf4.dst_factor);
+ blend(pos5, src5, dst5, con5, cnf5.src_factor, cnf5.dst_factor);
+
+ if (!piglit_probe_pixel_rgba(piglit_width * 1 / 12, 0, res0)) {
+ printf(" when testing FBO result, simple.\n");
+ pass = GL_FALSE;
+ }
+ blend_func_add(src1, dst1, NULL, cnf1.src_factor, cnf1.dst_factor,
res1);
+ if (!piglit_probe_pixel_rgba(piglit_width * 3 / 12, 0, res1)) {
+ printf(" when testing FBO result, blending with
inv_src/one.\n");
+ pass = GL_FALSE;
+ }
+ blend_func_add(src2, dst2, NULL, cnf2.src_factor, cnf2.dst_factor,
res2);
+ if (!piglit_probe_pixel_rgba(piglit_width * 5 / 12, 0, res2)) {
+ printf(" when testing FBO result, blending with
dst/inv_dst.\n");
+ pass = GL_FALSE;
+ }
+ blend_func_add(src3, dst3, NULL, cnf3.src_factor, cnf3.dst_factor,
res3);
+ if (!piglit_probe_pixel_rgba(piglit_width * 7 / 12, 0, res3)) {
+ printf(" when testing FBO result, blending with
src/inv_src.\n");
+ pass = GL_FALSE;
+ }
+ blend_func_add(src4, dst4, NULL, cnf4.src_factor, cnf4.dst_factor,
res4);
+ if (!piglit_probe_pixel_rgba(piglit_width * 9 / 12, 0, res4)) {
+ printf(" when testing FBO result, blending with src/src.\n");
+ pass = GL_FALSE;
+ }
+ blend_func_add(src5, dst5, con5, cnf5.src_factor, cnf5.dst_factor,
res5);
+ if (!piglit_probe_pixel_rgba(piglit_width * 11 / 12, 0, res5)) {
+ printf(" when testing FBO result, blending with
inv_constant/dst.\n");
+ pass = GL_FALSE;
+ }
+
+ piglit_present_results();
+
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void piglit_init(int argc, char **argv)
+{
+ /*
+ * Either need GL_EXT_texture_snorm or GL 3.1 (which introduced
+ * snorm formats, but only the non-legacy ones).
+ * Note neither guarantees it's renderable (in fact GL 3.1 lists
+ * it explicitly as "texture only" but later versions just say
+ * not required for rendering). That would need
+ * GL_ARB_internalformat_query2.
+ */
+ if (!piglit_is_extension_supported("GL_EXT_texture_snorm"))
+ piglit_require_gl_version(31);
+
+ glDisable(GL_DITHER);
+ /*
+ * Note that all values entering blend will still be clamped
+ * implicitly to [-1,1] for snorm formats.
+ */
+ glClampColor(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);
+ glClampColor(GL_CLAMP_VERTEX_COLOR, GL_FALSE);
+ glClampColor(GL_CLAMP_READ_COLOR, GL_FALSE);
+}