[Piglit] [PATCH 4/5] GL 3.2: Test that the Transform Feedback Buffer collects data before flatshading occurs
Nicholas Mack
nichmack at gmail.com
Tue Aug 20 10:56:51 PDT 2013
---
tests/spec/arb_provoking_vertex/CMakeLists.gl.txt | 1 +
.../arb_provoking_vertex/xfb-before-flatshading.c | 203 +++++++++++++++++++++
2 files changed, 204 insertions(+)
create mode 100644 tests/spec/arb_provoking_vertex/xfb-before-flatshading.c
diff --git a/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt b/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt
index a5ebff9..d70637c 100644
--- a/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt
+++ b/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt
@@ -12,5 +12,6 @@ link_libraries (
piglit_add_executable (arb-provoking-vertex-control provoking-vertex-control.c)
piglit_add_executable (arb-provoking-vertex-initial provoking-vertex-initial.c)
piglit_add_executable (arb-quads-follow-provoking-vertex quads-follow-provoking-vertex.c)
+piglit_add_executable (arb-xfb-before-flatshading xfb-before-flatshading.c)
# vim: ft=cmake:
diff --git a/tests/spec/arb_provoking_vertex/xfb-before-flatshading.c b/tests/spec/arb_provoking_vertex/xfb-before-flatshading.c
new file mode 100644
index 0000000..359ad68
--- /dev/null
+++ b/tests/spec/arb_provoking_vertex/xfb-before-flatshading.c
@@ -0,0 +1,203 @@
+/**
+ * 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.
+ */
+
+/**
+ * Test that transform feedback occurs before flatshading
+ *
+ * Section 2.16(Transform Feedback) of OpenGL 3.2 Core says:
+ * "In transform feedback mode, attributes of the vertices of transformed
+ * primitives processed by a vertex shader, or primitives generated by a
+ * geometry shader if one is active, are written out to one or more buffer
+ * objects. The vertices are fed back after vertex color clamping, but before
+ * flatshading and clipping."
+ *
+ */
+
+#include "piglit-util-gl-common.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 32;
+ config.supports_gl_core_version = 32;
+
+ config.window_width = 100;
+ config.window_height = 100;
+ config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static const char *vstext =
+ "#version 130\n"
+ "in vec3 vert1;\n"
+ "in vec3 color;\n"
+ "flat out vec3 color1;\n"
+ "out vec3 vert;\n"
+ "void main() {\n"
+ " gl_Position = vec4(vert1, 1.);\n"
+ " vert = vert1;\n"
+ " color1 = color;\n"
+ "}\n";
+
+static const char *fstext =
+ "#version 130\n"
+ "in vec3 vert;\n"
+ "flat in vec3 color1;\n"
+ "void main() {\n"
+ " gl_FragColor = vec4(color1, 1.);\n"
+ "}\n";
+
+static GLuint vao;
+static GLuint vertBuff;
+static GLuint indexBuf;
+static GLuint vertColorBuf;
+
+static GLfloat vertices[] = {
+ -1.0, 1.0, 0.0,
+ 1.0, 1.0, 0.0,
+ 1.0,-1.0, 0.0,
+ -1.0,-1.0, 0.0
+};
+static GLsizei vertSize = sizeof(vertices);
+
+static GLfloat vertColors[] = {
+ 1.0, 0.0, 0.0,
+ 0.0, 1.0, 0.0,
+ 0.0, 0.0, 1.0,
+ 0.0, 1.0, 0.0
+};
+static GLsizei vertColorSize = sizeof(vertColors);
+
+static GLuint indices[] = {
+ 0, 1, 2, 0, 2, 3
+};
+static GLsizei indSize = sizeof(indices);
+
+static GLuint xfb_buf;
+static GLuint prog;
+
+/* Only capture the color data into the transform feedback buffer */
+static const char *varyings[] = { "color1" };
+
+/* Calculate number of floats contained in the transform varyings */
+static int numVaryingFloats = ARRAY_SIZE(varyings) * ARRAY_SIZE(indices) * 3;
+
+void
+piglit_init(int argc, char **argv)
+{
+ bool pass = true;
+ GLuint vs = 0, fs = 0;
+ GLuint vertIndex;
+ GLuint vertColorIndex;
+
+ prog = glCreateProgram();
+ vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vstext);
+ fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fstext);
+ glAttachShader(prog, vs);
+ glAttachShader(prog, fs);
+ glTransformFeedbackVaryings(prog, ARRAY_SIZE(varyings), varyings,
+ GL_INTERLEAVED_ATTRIBS);
+ glLinkProgram(prog);
+ if(!piglit_link_check_status(prog)){
+ glDeleteProgram(prog);
+ piglit_report_result(PIGLIT_FAIL);
+ }
+
+ glUseProgram(prog);
+
+ glGenBuffers(1, &vertBuff);
+ glBindBuffer(GL_ARRAY_BUFFER, vertBuff);
+ glBufferData(GL_ARRAY_BUFFER, vertSize, vertices, GL_STATIC_DRAW);
+
+ glGenBuffers(1, &indexBuf);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
+ glBufferData(GL_ELEMENT_ARRAY_BUFFER, indSize,
+ indices, GL_STATIC_DRAW);
+
+ glGenBuffers(1, &vertColorBuf);
+ glBindBuffer(GL_ARRAY_BUFFER, vertColorBuf);
+ glBufferData(GL_ARRAY_BUFFER, vertColorSize,
+ vertColors, GL_STATIC_DRAW);
+
+ glGenVertexArrays(1, &vao);
+ glBindVertexArray(vao);
+
+ vertIndex = glGetAttribLocation(prog, "vert1");
+ vertColorIndex = glGetAttribLocation(prog, "color");
+
+ glBindBuffer(GL_ARRAY_BUFFER, vertBuff);
+ glEnableVertexAttribArray(vertIndex);
+ glVertexAttribPointer(vertIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
+
+ glBindBuffer(GL_ARRAY_BUFFER, vertColorBuf);
+ glEnableVertexAttribArray(vertColorIndex);
+ glVertexAttribPointer(vertColorIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
+
+ glGenBuffers(1, &xfb_buf);
+ glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf);
+ glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
+ numVaryingFloats * sizeof(float),
+ NULL, GL_STREAM_READ);
+
+ pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
+}
+
+enum piglit_result
+piglit_display(void)
+{
+ float *xBuffer;
+ int i;
+ bool pass = true;
+
+ glClearColor(0.2, 0.2, 0.2, 1.0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glBindVertexArray(vao);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
+
+ glBeginTransformFeedback(GL_TRIANGLES);
+ glDrawElements(GL_TRIANGLES, ARRAY_SIZE(indices),
+ GL_UNSIGNED_INT, NULL);
+ glEndTransformFeedback();
+
+ xBuffer = (float*)glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, GL_READ_ONLY);
+ /* Compare transform feedback color data with original color data */
+ for(i = 0; i < numVaryingFloats/3; i++) {
+ bool unchanged = true;
+ if(xBuffer[i*3+0] != vertColors[0+3*indices[i]])
+ unchanged = false;
+ if(xBuffer[i*3+1] != vertColors[1+3*indices[i]])
+ unchanged = false;
+ if(xBuffer[i*3+2] != vertColors[2+3*indices[i]])
+ unchanged = false;
+ if(!unchanged) {
+ printf("Vertex %d color was modified before being "
+ "copied into the transform buffer.\n", i);
+ pass = false;
+ }
+ }
+ glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
+
+ piglit_present_results();
+
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
--
1.8.3.1
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