ext_color_buffer_float: check fp32 blend enforcement

Without EXT_float_blend, fp32 blending should be disallowed. Ensure that
this is the case. If it is supported, ensure that blending works as
expected.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

5 files changed, 173 insertions, 0 deletions

diff --git a/tests/opengl.py b/tests/opengl.py
index 83f980177..8e84e2cfc 100644
--- a/tests/opengl.py
+++ b/tests/opengl.py
@@ -4967,5 +4967,10 @@ with profile.test_list.group_manager(
         grouptools.join('spec', 'NV_image_formats')) as g:
     g(['nv_image_formats-gles3'])
 
+with profile.test_list.group_manager(
+        PiglitGLTest,
+        grouptools.join('spec', 'EXT_color_buffer_float')) as g:
+    g(['ext_color_buffer_float-draw_gles3'])
+
 if platform.system() is 'Windows':
     profile.filters.append(lambda p, _: not p.startswith('glx'))
diff --git a/tests/spec/CMakeLists.txt b/tests/spec/CMakeLists.txt
index 74edc5f24..faa3c2c7c 100644
--- a/tests/spec/CMakeLists.txt
+++ b/tests/spec/CMakeLists.txt
@@ -186,3 +186,4 @@ add_subdirectory (ext_texture_norm16)
 add_subdirectory (ext_render_snorm)
 add_subdirectory (ext_texture_compression_bptc)
 add_subdirectory (ext_texture_compression_rgtc)
+add_subdirectory (ext_color_buffer_float)
diff --git a/tests/spec/ext_color_buffer_float/CMakeLists.gles3.txt b/tests/spec/ext_color_buffer_float/CMakeLists.gles3.txt
new file mode 100644
index 000000000..da89f5c04
--- /dev/null
+++ b/tests/spec/ext_color_buffer_float/CMakeLists.gles3.txt
@@ -0,0 +1,3 @@
+link_libraries(piglitutil_${piglit_target_api})
+
+piglit_add_executable (ext_color_buffer_float-draw_gles3 draw.c)
diff --git a/tests/spec/ext_color_buffer_float/CMakeLists.txt b/tests/spec/ext_color_buffer_float/CMakeLists.txt
new file mode 100644
index 000000000..144a306f4
--- /dev/null
+++ b/tests/spec/ext_color_buffer_float/CMakeLists.txt
@@ -0,0 +1 @@
+piglit_include_target_api()
diff --git a/tests/spec/ext_color_buffer_float/draw.c b/tests/spec/ext_color_buffer_float/draw.c
new file mode 100644
index 000000000..c174197c4
--- /dev/null
+++ b/tests/spec/ext_color_buffer_float/draw.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2019 Ilia Mirkin
+ *
+ * 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.
+ */
+
+/**
+ * \file draw.c
+ *
+ * Test that GL_EXT_color_buffer_float's blending restriction is
+ * properly respected. Either the implementation rejects draws with
+ * FP32 blending, or it exposes GL_EXT_float_blend.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_es_version = 30;
+	config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
+PIGLIT_GL_TEST_CONFIG_END
+
+#define SIZE 128
+
+enum piglit_result
+piglit_display(void)
+{
+	return PIGLIT_SKIP; /* Never reached */
+}
+
+static void
+check_draw_success()
+{
+	static const float green[4] = {0, 1, 0, 1};
+	float *buffer;
+	int i;
+
+	if (!piglit_check_gl_error(GL_NO_ERROR)) {
+		printf("FAIL: Basic drawing\n");
+		piglit_report_result(PIGLIT_FAIL);
+	}
+
+	glReadBuffer(GL_COLOR_ATTACHMENT0);
+	buffer = malloc(SIZE * SIZE * 4 * sizeof(float));
+	glReadPixels(0, 0, 128, 128, GL_RGBA, GL_FLOAT, buffer);
+	for (i = 0; i < SIZE * SIZE; i++) {
+		float *pixel = &buffer[4 * i];
+		if (memcmp(pixel, green, sizeof(green))) {
+			printf("FAIL: Basic draw color at (%d, %d)\n", i / SIZE, i % SIZE);
+			printf("Expected: %f %f %f %f\n", green[0], green[1], green[2], green[3]);
+			printf("Actual  : %f %f %f %f\n", pixel[0], pixel[1], pixel[2], pixel[3]);
+			piglit_report_result(PIGLIT_FAIL);
+		}
+	}
+	free(buffer);
+
+	glClear(GL_COLOR_BUFFER_BIT);
+}
+
+static void
+check_blend(bool float_blend)
+{
+	if (float_blend) {
+		check_draw_success();
+	} else if (!piglit_check_gl_error(GL_INVALID_OPERATION)) {
+		printf("FAIL: Unexpected draw success in presence of blend.\n");
+		piglit_report_result(PIGLIT_FAIL);
+	}
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	GLint prog;
+	GLuint fb, rb[2];
+	GLenum ret;
+	bool float_blend, indexed;
+
+	piglit_require_extension("GL_EXT_color_buffer_float");
+	float_blend = piglit_is_extension_supported("GL_EXT_float_blend");
+	indexed = piglit_is_extension_supported("GL_OES_draw_buffers_indexed");
+
+	prog = piglit_build_simple_program(
+			"#version 300 es\n"
+			"in vec4 piglit_vertex;\n"
+			"void main() { gl_Position = piglit_vertex; }\n",
+
+			"#version 300 es\n"
+			"precision highp float;\n"
+			"out vec4 color;\n"
+			"out vec4 color2;\n"
+			"void main() { color2 = color = vec4(0, 1, 0, 1); }\n");
+	glUseProgram(prog);
+
+	glGenRenderbuffers(2, rb);
+	glBindRenderbuffer(GL_RENDERBUFFER, rb[0]);
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA32F, SIZE, SIZE);
+	glBindRenderbuffer(GL_RENDERBUFFER, rb[1]);
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA16F, SIZE, SIZE);
+
+	glGenFramebuffers(1, &fb);
+	glBindFramebuffer(GL_FRAMEBUFFER, fb);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rb[0]);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_RENDERBUFFER, rb[1]);
+
+	ret = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+	if (ret != GL_FRAMEBUFFER_COMPLETE) {
+		printf("FAIL: Framebuffer incomplete\n");
+		piglit_report_result(PIGLIT_FAIL);
+	}
+
+	glViewport(0, 0, SIZE, SIZE);
+	glClearColor(0.2, 0.2, 0.2, 0.2);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	piglit_draw_rect(-1, -1, 2, 2);
+	check_draw_success();
+
+	if (!indexed) {
+		glEnable(GL_BLEND);
+		piglit_draw_rect(-1, -1, 2, 2);
+
+		check_blend(float_blend);
+		piglit_report_result(PIGLIT_PASS);
+	}
+
+	/* RT0 = GL_RGBA32F. Draw should error. */
+	glEnablei(GL_BLEND, 0);
+
+	piglit_draw_rect(-1, -1, 2, 2);
+	check_blend(float_blend);
+
+	/* RT1 = GL_RGBA16F. Should draw fine. */
+	glDisablei(GL_BLEND, 0);
+	glEnablei(GL_BLEND, 1);
+
+	piglit_draw_rect(-1, -1, 2, 2);
+	check_draw_success();
+
+	/* Both RT's enabled. Should fail. */
+	glEnablei(GL_BLEND, 0);
+
+	piglit_draw_rect(-1, -1, 2, 2);
+	check_blend(float_blend);
+
+	piglit_report_result(PIGLIT_PASS);
+}