Tests rendering into a single framebuffer surface with multiple viewports
via a geometry shader. Confirm that each area of the surface delineated by
a viewport renders the correct color. Use multiple draw calls to replicate
geometry rather than the geometry shader.
Tested on Nvidia Quadro 600, test passes.
---
tests/all.tests | 1 +
tests/spec/arb_viewport_array/CMakeLists.gl.txt | 1 +
tests/spec/arb_viewport_array/render_viewport.c | 168 ++++++++++++++++++++++++
3 files changed, 170 insertions(+)
create mode 100644 tests/spec/arb_viewport_array/render_viewport.c
diff --git a/tests/all.tests b/tests/all.tests
index 0ed93b6..9bfb947 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -1737,6 +1737,7 @@ arb_viewport_array['scissor-indices'] =
concurrent_test('arb_viewport_array-scis
arb_viewport_array['bounds'] = concurrent_test('arb_viewport_array-bounds')
arb_viewport_array['queries'] = concurrent_test('arb_viewport_array-queries')
arb_viewport_array['minmax'] = concurrent_test('arb_viewport_array-minmax')
+arb_viewport_array['render-viewport'] =
concurrent_test('arb_viewport_array-render-viewport')
nv_vertex_program = Group()
spec['NV_vertex_program'] = nv_vertex_program
diff --git a/tests/spec/arb_viewport_array/CMakeLists.gl.txt
b/tests/spec/arb_viewport_array/CMakeLists.gl.txt
index 155b62a..0514b81 100644
--- a/tests/spec/arb_viewport_array/CMakeLists.gl.txt
+++ b/tests/spec/arb_viewport_array/CMakeLists.gl.txt
@@ -15,5 +15,6 @@ piglit_add_executable(arb_viewport_array-scissor-indices
scissor_indices.c)
piglit_add_executable(arb_viewport_array-bounds bounds.c)
piglit_add_executable(arb_viewport_array-queries queries.c)
piglit_add_executable(arb_viewport_array-minmax minmax.c)
+piglit_add_executable(arb_viewport_array-render-viewport render_viewport.c)
# vim: ft=cmake:
diff --git a/tests/spec/arb_viewport_array/render_viewport.c
b/tests/spec/arb_viewport_array/render_viewport.c
new file mode 100644
index 0000000..0cfb8d2
--- /dev/null
+++ b/tests/spec/arb_viewport_array/render_viewport.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright © 2013 LunarG, Inc.
+ *
+ * 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.
+ *
+ * Author: Jon Ashburn <j...@lunarg.com>
+ */
+
+/**
+ * Tests rendering into a single framebuffer surface with multiple viewports
+ * via a geometry shader. Confirm that each area of the surface delineated by
+ * a viewport renders the correct color. Use multiple draw
+ * calls to replicate geometry rather than the geometry shader.
+ * From the extension registry for ARB_viewport_array:
+ * "This extension enhances OpenGL by providing a mechanism to expose
+ * multiple viewports. Each viewport is specified as a rectangle. The
+ * destination viewport may be selected per-primitive by the geometry
+ * shader. This allows the Geometry Shader to produce different versions
+ * of primitives destined for separate viewport rectangles on the same
+ * surface.
+ */
+#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_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+const char *vsSource = {
+ "#version 410\n"
+ "in vec4 piglit_vertex;\n"
+ "void main() {\n"
+ " gl_Position = piglit_vertex;\n"
+ "}\n"
+};
+
+const char *gsSource = {
+ "#version 410\n"
+ "layout(triangles) in;\n"
+ "layout(triangle_strip, max_vertices = 3) out;\n"
+ "uniform int idx;\n"
+ "\n"
+ "void main()\n"
+ "{\n"
+ " gl_ViewportIndex = idx;\n"
+ " for(int i = 0; i < gl_in.length(); i++) {\n"
+ " gl_Position = gl_in[i].gl_Position;\n"
+ " EmitVertex();\n"
+ " }\n"
+ " EndPrimitive();\n"
+ "}\n"
+};
+
+const char *fsSource = {
+ "#version 410\n"
+ "uniform vec3 color;\n"
+ "void main() {\n"
+ " gl_FragColor = vec4(color.xyz, 1.0);\n"
+ "}\n"
+};
+
+static GLuint colorLoc;
+static GLuint vpIndexLoc;
+
+/**
+ * Draws a single quad into multiple viewport each with a different
+ * color. Reads back the expected color to test if the drawing was correct.
+ * @param changeVPloc; if true then the geometry shader viewport location
+ * is changed with each loop, otherwise shader location is fixed.
+ */
+static bool
+draw_multi_viewport(const bool changeVPLoc)
+{
+ bool pass = true;
+ int i, j;
+ const int divX=2, divY=4;
+ GLfloat w = (GLfloat) piglit_width / (GLfloat) divX;
+ GLfloat h = (GLfloat) piglit_height / (GLfloat) divY;
+ GLfloat colors[][3] = {{0.0, 0.0, 1.0},
+ {0.0, 1.0, 0.0},
+ {1.0, 0.0, 0.0},
+ {1.0, 1.0, 0.0},
+ {0.0, 1.0, 1.0},
+ {1.0, 0.0, 1.0},
+ {1.0, 1.0, 1.0},
+ {0.0, 0.0, 0.5},
+ {0.0, 0.0, 0.0}};
+
+ assert(ARRAY_SIZE(colors) == divX*divY + 1);
+
+ glClear(GL_COLOR_BUFFER_BIT);
+ glUniform1i(vpIndexLoc, divX * divY);
+ glViewportIndexedf(divX * divY, -10.0, -30.0, piglit_width, 20.0);
+ for (i = 0; i < divX; i++) {
+ for (j = 0; j < divY; j++) {
+ int p;
+ GLfloat *expected;
+ glUniform3fv(colorLoc, 1, &colors[j + i*divY][0]);
+ if (changeVPLoc) {
+ glUniform1i(vpIndexLoc, j + i*divY);
+ expected = &colors[j + i*divY][0];
+ } else {
+ expected = &colors[divX * divY][0];
+ }
+ glViewportIndexedf(j + i*divY, i * w, j * h, w, h);
+ piglit_draw_rect(-1, -1, 2, 2);
+ pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
+ p = piglit_probe_pixel_rgb(i * w + w/2, j * h + h/2,
+ expected);
+ piglit_present_results();
+ if (!p) {
+ printf("Wrong color for viewport i,j %d %d
changeVP=%d\n",
+ i, j, changeVPLoc);
+ pass = false;
+ }
+ }
+ }
+ return pass;
+}
+
+enum piglit_result
+piglit_display(void)
+{
+ bool pass= true;
+
+ pass = draw_multi_viewport(true);
+ pass = draw_multi_viewport(false);
+ pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+ GLuint program;
+
+ piglit_require_extension("GL_ARB_viewport_array");
+
+ program = piglit_build_simple_program_multiple_shaders(
+ GL_VERTEX_SHADER, vsSource,
+ GL_GEOMETRY_SHADER, gsSource,
+ GL_FRAGMENT_SHADER, fsSource,
+ 0);
+ glUseProgram(program);
+ colorLoc = glGetUniformLocation(program, "color");
+ vpIndexLoc = glGetUniformLocation(program, "idx");
+}
--
1.8.1.2
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