[Piglit] [PATCH] gs: Test corner case for triangle strip ordering with primitive restart.
Pohjolainen, Topi
topi.pohjolainen at intel.com
Fri Aug 30 01:20:18 PDT 2013
On Wed, Aug 28, 2013 at 12:12:40PM -0700, Paul Berry wrote:
> Verified using the NVIDIA proprietary driver for linux.
> ---
> tests/all.tests | 6 +
> .../glsl-1.50/execution/geometry/CMakeLists.gl.txt | 1 +
> .../tri-strip-ordering-with-prim-restart.c | 311 +++++++++++++++++++++
> 3 files changed, 318 insertions(+)
> create mode 100644 tests/spec/glsl-1.50/execution/geometry/tri-strip-ordering-with-prim-restart.c
>
> diff --git a/tests/all.tests b/tests/all.tests
> index 7ab841e..3ee7cd2 100644
> --- a/tests/all.tests
> +++ b/tests/all.tests
> @@ -955,6 +955,12 @@ for prim_type in ['GL_POINTS', 'GL_LINE_LOOP', 'GL_LINE_STRIP', 'GL_LINES',
> 'glsl-1.50-geometry-primitive-types {0}'.format(
> prim_type))
>
> +for prim_type in ['GL_TRIANGLE_STRIP', 'GL_TRIANGLE_STRIP_ADJACENCY']:
> + for restart_index in ['ffs', 'other']:
> + add_concurrent_test(spec['glsl-1.50'],
> + 'glsl-1.50-geometry-tri-strip-ordering-with-prim-restart {0} {1}'.format(
> + prim_type, restart_index))
> +
> spec['glsl-3.30'] = Group()
> import_glsl_parser_tests(spec['glsl-3.30'],
> os.path.join(testsDir, 'spec', 'glsl-3.30'),
> diff --git a/tests/spec/glsl-1.50/execution/geometry/CMakeLists.gl.txt b/tests/spec/glsl-1.50/execution/geometry/CMakeLists.gl.txt
> index 202fcd2..a504412 100644
> --- a/tests/spec/glsl-1.50/execution/geometry/CMakeLists.gl.txt
> +++ b/tests/spec/glsl-1.50/execution/geometry/CMakeLists.gl.txt
> @@ -12,3 +12,4 @@ ${OPENGL_glu_LIBRARY}
>
> piglit_add_executable (glsl-1.50-geometry-end-primitive end-primitive.c)
> piglit_add_executable (glsl-1.50-geometry-primitive-types primitive-types.c)
> +piglit_add_executable (glsl-1.50-geometry-tri-strip-ordering-with-prim-restart tri-strip-ordering-with-prim-restart.c)
> diff --git a/tests/spec/glsl-1.50/execution/geometry/tri-strip-ordering-with-prim-restart.c b/tests/spec/glsl-1.50/execution/geometry/tri-strip-ordering-with-prim-restart.c
> new file mode 100644
> index 0000000..90f6860
> --- /dev/null
> +++ b/tests/spec/glsl-1.50/execution/geometry/tri-strip-ordering-with-prim-restart.c
> @@ -0,0 +1,311 @@
> +/*
> + * Copyright © 2013 Intel Corporation
> + *
> + * 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 tri-strip-ordering-with-prim-restart.c
> + *
> + * Check a subtle corner case that affects the i965/gen7 mesa driver:
> + * when the primitive type is either GL_TRIANGLE_STRIP or
> + * GL_TRIANGLE_STRIP_ADJACENCY, the hardware delivers the vertices of
> + * odd numbered triangles to the geometry shader in the wrong order,
> + * so the driver must emit workaround code to re-order them. This
> + * test verifies that the workaround code functions correctly in the
> + * presence of primitive restart, since the presence of primitive
> + * restart can make a triangle "odd numbered" in relation to the
> + * current strip even if it is "even numbered" as measured by
> + * gl_PrimitiveIDIn.
> + *
> + * This test works by issuing a single draw call and using primitive
> + * restart to split it into a pair of 3-triangle strips (this ensures
> + * that triangles in the first strip have the same parity in relation
> + * to the strip as they have when measured by gl_PrimitiveIDIn;
> + * triangles in the second strip hav opposite parity in relation to
> + * the strip from what they have when measured by gl_PrimitiveIDIn).
> + * The vertex IDs of all vertices are collected using transform
> + * feedback, and checked it C to make sure it matches the expected
^
Just checking if this was supposed to be "checked in C" instead?
> + * sequence of vertices.
> + *
> + * Note: some generations of Intel hardware require primitive restart
> + * to be emulated in software when either:
> + *
> + * - certain primitive types are used, or
> + *
> + * - the primitive restart index is not all 0xff's.
> + *
> + * To make sure that both the hardware and software primitive restart
> + * codepaths are tested, this test accepts an additional command line
> + * option to control whether the primitive restart index should be all
> + * 0xff's.
> + */
> +
> +#include "piglit-util-gl-common.h"
> +
> +PIGLIT_GL_TEST_CONFIG_BEGIN
> +
> + config.supports_gl_compat_version = 32;
> + config.supports_gl_core_version = 32;
> +
> +PIGLIT_GL_TEST_CONFIG_END
> +
> +
> +/**
> + * 5 triangles per strip, 6 vertices per triangle in
> + * GL_TRIANGLE_STRIP_ADJACENCY mode.
> + */
> +#define MAX_OUTPUT_VERTICES_PER_STRIP (5*6)
> +
> +
> +static const char *vs_text =
> + "#version 150\n"
> + "\n"
> + "out int vertex_id;\n"
> + "\n"
> + "void main()\n"
> + "{\n"
> + " vertex_id = gl_VertexID;\n"
> + "}\n";
> +
> +static const char *gs_template =
> + "#version 150\n"
> + "#define INPUT_LAYOUT %s\n"
> + "#define VERTICES_PER_PRIM %d\n"
> + "layout(INPUT_LAYOUT) in;\n"
> + "layout(points, max_vertices = VERTICES_PER_PRIM) out;\n"
> + "\n"
> + "in int vertex_id[VERTICES_PER_PRIM];\n"
> + "out int vertex_out[VERTICES_PER_PRIM];\n"
> + "\n"
> + "void main()\n"
> + "{\n"
> + " for (int i = 0; i < VERTICES_PER_PRIM; i++) {\n"
> + " vertex_out[i] = vertex_id[i] + 1;\n"
> + " }\n"
> + " EmitVertex();\n"
> + "}\n";
> +
> +
> +static const char *varyings[] = {
> + "vertex_out[0]",
> + "vertex_out[1]",
> + "vertex_out[2]",
> + "vertex_out[3]",
> + "vertex_out[4]",
> + "vertex_out[5]",
> +};
> +
> +
> +static const struct test_vector
> +{
> + const char *name;
> + GLenum prim_type;
> + const char *input_layout;
> + unsigned vertices_per_prim;
> +
> + /**
> + * Number of vertices to send down the pipeline for a single
> + * 3-triangle strip
> + */
> + unsigned input_vertices_per_strip;
> +
> + /**
> + * Number of output vertices that are expected for a single
> + * 3-triangle strip
> + */
> + unsigned output_vertices_per_strip;
> +
> + /**
> + * Vertices that each GS invocation is expected to see for a
> + * single 3-triangle strip.
> + */
> + GLint expected_results[MAX_OUTPUT_VERTICES_PER_STRIP];
> +} tests[] = {
> + { "GL_TRIANGLE_STRIP", GL_TRIANGLE_STRIP, "triangles", 3, 5, 9,
> + { 1, 2, 3,
> + 3, 2, 4,
> + 3, 4, 5 } },
> + /* See primitive-types.c for how this vertex ordering was
> + * determined.
> + */
> + { "GL_TRIANGLE_STRIP_ADJACENCY", GL_TRIANGLE_STRIP_ADJACENCY,
> + "triangles_adjacency", 6, 10, 18,
> + { 1, 2, 3, 7, 5, 4,
> + 5, 1, 3, 6, 7, 9,
> + 5, 3, 7, 10, 9, 8 } },
> +};
> +
> +
> +static void
> +print_usage_and_exit(const char *prog_name)
> +{
> + int i;
> + printf("Usage: %s <primitive> <restart-index>\n"
> + " where <primitive> is one of the following:\n", prog_name);
> + for(i = 0; i < ARRAY_SIZE(tests); i++)
> + printf(" %s\n", tests[i].name);
> + printf(" and <restart-index> is one of the following:\n"
> + " ffs - use a primitive restart index that is all 0xffs\n"
> + " other - use a different primitive restart index\n");
> + piglit_report_result(PIGLIT_FAIL);
> +}
> +
> +
> +void
> +piglit_init(int argc, char **argv)
> +{
> + int i, j;
> + const struct test_vector *test = NULL;
> + GLubyte prim_restart_index;
> + GLuint prog, vs, gs, vao, xfb_buf, generated_query, element_buf,
> + primitives_generated;
> + char *gs_text;
> + GLsizei num_input_elements;
> + GLubyte *elements;
> + bool pass = true;
> + unsigned expected_output_points_per_strip, actual_output_points;
> + GLuint *readback;
> +
> + /* Parse params */
> + if (argc != 3)
> + print_usage_and_exit(argv[0]);
> + for (i = 0; i < ARRAY_SIZE(tests); i++) {
> + if (strcmp(argv[1], tests[i].name) == 0) {
> + test = &tests[i];
> + break;
> + }
> + }
> + if (tests == NULL)
> + print_usage_and_exit(argv[0]);
> + if (strcmp(argv[2], "ffs") == 0)
> + prim_restart_index = 0xff;
> + else if (strcmp(argv[2], "other") == 0)
> + prim_restart_index = 0x80;
> + else
> + print_usage_and_exit(argv[0]);
> +
> + /* Compile shaders */
> + prog = glCreateProgram();
> + vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_text);
> + glAttachShader(prog, vs);
> + asprintf(&gs_text, gs_template, test->input_layout,
> + test->vertices_per_prim);
> + gs = piglit_compile_shader_text(GL_GEOMETRY_SHADER, gs_text);
> + free(gs_text);
> + glAttachShader(prog, gs);
> + glTransformFeedbackVaryings(prog, test->vertices_per_prim, varyings,
> + GL_INTERLEAVED_ATTRIBS);
> + glLinkProgram(prog);
> + if (!piglit_link_check_status(prog))
> + piglit_report_result(PIGLIT_FAIL);
> + glUseProgram(prog);
> +
> + /* Set up other GL state */
> + glGenVertexArrays(1, &vao);
> + glBindVertexArray(vao);
> + glGenBuffers(1, &xfb_buf);
> + glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf);
> + glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
> + MAX_OUTPUT_VERTICES_PER_STRIP * 2 * sizeof(GLint), NULL,
> + GL_STREAM_READ);
> + glGenQueries(1, &generated_query);
> + glEnable(GL_RASTERIZER_DISCARD);
> + glEnable(GL_PRIMITIVE_RESTART);
> + glPrimitiveRestartIndex(prim_restart_index);
> +
> + /* Set up element buffer containing:
> + *
> + * [0, 1, ..., input_vertices_per_strip-1, prim_restart_index,
> + * 0, 1, ..., input_vertices_per_strip-1]
> + */
> + num_input_elements = test->input_vertices_per_strip * 2 + 1;
> + glGenBuffers(1, &element_buf);
> + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, element_buf);
> + glBufferData(GL_ELEMENT_ARRAY_BUFFER,
> + sizeof(GLubyte) * num_input_elements, NULL,
> + GL_STATIC_DRAW);
> + elements = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_READ_WRITE);
> + for (i = 0; i < test->input_vertices_per_strip; i++) {
> + elements[i] = i;
> + elements[i + test->input_vertices_per_strip + 1] = i;
> + }
> + elements[test->input_vertices_per_strip] = prim_restart_index;
> + glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
> +
> + /* Run vertices through the pipeline */
> + glBeginQuery(GL_PRIMITIVES_GENERATED, generated_query);
> + glBeginTransformFeedback(GL_POINTS);
> + glDrawElements(test->prim_type, num_input_elements, GL_UNSIGNED_BYTE,
> + NULL);
> + glEndTransformFeedback();
> + glEndQuery(GL_PRIMITIVES_GENERATED);
> +
> + /* Check that the GS got invoked the right number of times */
> + glGetQueryObjectuiv(generated_query, GL_QUERY_RESULT,
> + &primitives_generated);
> + if (primitives_generated != 6) {
> + printf("Expected 6 GS invocations, got %d\n",
> + primitives_generated);
> + pass = false;
> + }
> + expected_output_points_per_strip = 3 * test->vertices_per_prim;
> + actual_output_points = primitives_generated * test->vertices_per_prim;
> +
> + /* Check the data output by the GS. The expected output is
> + * two exact copies of test->expected_results, one for each
> + * strip.
> + */
> + readback = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, GL_READ_ONLY);
> + if (memcmp(readback, test->expected_results,
> + expected_output_points_per_strip * sizeof(GLint)) != 0) {
> + pass = false;
> + }
> + if (memcmp(readback + expected_output_points_per_strip,
> + test->expected_results,
> + expected_output_points_per_strip * sizeof(GLint)) != 0) {
> + pass = false;
> + }
> +
> + /* Output details if the result was wrong */
> + if (!pass) {
> + printf("Expected vertex IDs:");
> + for (i = 0; i < 2; i++)
> + for (j = 0; j < expected_output_points_per_strip; j++)
> + printf(" %d", test->expected_results[j]);
> + printf("\n");
> + printf("Actual vertex IDs:");
> + for (i = 0; i < actual_output_points; i++)
> + printf(" %d", readback[i]);
> + printf("\n");
> + }
> +
> + glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
> +
> + piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
> +}
> +
> +
> +enum piglit_result
> +piglit_display(void)
> +{
> + /* Should never be reached */
> + return PIGLIT_FAIL;
> +}
> --
> 1.8.4
>
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