add test for EXT_multi_draw_arrays

This test is a copy of multidrawarrays-vertexid.c, ported to use
OpenGL ES 3.1 and GL_EXT_multi_draw_arrays instead.

Part-of: <!991>

tests/spec/CMakeLists.txt

@@ -100,6 +100,7 @@ add_subdirectory (ext_framebuffer_multisample)
 add_subdirectory (ext_framebuffer_multisample_blit_scaled)
 add_subdirectory (ext_framebuffer_object)
 add_subdirectory (ext_gpu_shader4)
+add_subdirectory (ext_multi_draw_indirect)
 add_subdirectory (ext_packed_depth_stencil)
 add_subdirectory (ext_packed_float)
 add_subdirectory (ext_shader_image_load_store)

tests/spec/ext_multi_draw_indirect/CMakeLists.gles3.txt

+include_directories(
+	${GLEXT_INCLUDE_DIR}
+	${OPENGL_INCLUDE_PATH}
+)
+
+link_libraries (
+	piglitutil_${piglit_target_api}
+	${OPENGL_gl_LIBRARY}
+)
+
+piglit_add_executable (ext_multi_draw_indirect-vertexid vertexid.c)
+
+# vim: ft=cmake:

tests/spec/ext_multi_draw_indirect/CMakeLists.txt

+piglit_include_target_api()

tests/spec/ext_multi_draw_indirect/vertexid.c

+/* Copyright © 2014 Intel Corporation
+ * Copyright © 2025 Collabora Ltd.
+ *
+ * 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 vertexid.c
+ * Test using gl_VertexID in conjunction with glMultiDrawArraysIndirect
+ *
+ * The value of gl_VertexID observed in the shader should start with the value
+ * of 'first' and increment from there.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_es_version = 31;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+	config.khr_no_error_support = PIGLIT_NO_ERRORS;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static const float green[]   = { 0, 1, 0, 1 };
+static const float blue[]    = { 0, 0, 1, 1 };
+static const float gold[]    = { 1, 1, 0, 1 };
+static const float magenta[] = { 1, 0, 1, 1 };
+
+enum piglit_result
+piglit_display(void)
+{
+	bool pass = true;
+	static const GLint first[] = { 4, 8, 12, 16 };
+	static const GLsizei count[ARRAY_SIZE(first)] = { 4, 4, 4, 4 };
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	glClearColor(0.2, 0.2, 0.2, 0.2);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	unsigned data[ARRAY_SIZE(count) * 4];
+
+	for (unsigned i = 0; i < ARRAY_SIZE(count); i++) {
+		data[i*4+0] = count[i];
+		data[i*4+1] = 1;
+		data[i*4+2] = first[i];
+		data[i*4+3] = 0;
+	}
+	GLuint ib;
+
+	glGenBuffers(1, &ib);
+	glBindBuffer(GL_DRAW_INDIRECT_BUFFER, ib);
+	glBufferData(GL_DRAW_INDIRECT_BUFFER, sizeof(data), data,
+		     GL_STATIC_DRAW);
+
+	glMultiDrawArraysIndirectEXT(GL_TRIANGLE_FAN, NULL,
+				     ARRAY_SIZE(count), 0);
+	glDeleteBuffers(1, &ib);
+
+	pass = piglit_probe_rect_rgba(0, 0,
+				      piglit_width / 2, piglit_height /2,
+				      green)
+		&& pass;
+	pass = piglit_probe_rect_rgba(piglit_width / 2, 0,
+				      piglit_width / 2, piglit_height / 2,
+				      blue)
+		&& pass;
+	pass = piglit_probe_rect_rgba(0, piglit_height /2,
+				      piglit_width / 2, piglit_height / 2,
+				      gold)
+		&& pass;
+	pass = piglit_probe_rect_rgba(piglit_width / 2, piglit_height /2,
+				      piglit_width / 2, piglit_height / 2,
+				      magenta)
+		&& pass;
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_EXT_multi_draw_indirect");
+
+	static const GLfloat verts[] = {
+		/* These vertices should never be accessed due to the way
+		 * glMultiDrawArrays is called.
+		 */
+		-1.0, -1.0,
+		 1.0, -1.0,
+		 1.0,  1.0,
+		-1.0,  1.0,
+
+		-1.0, -1.0,
+		 0.0, -1.0,
+		 0.0,  0.0,
+		-1.0,  0.0,
+
+		 0.0, -1.0,
+		 1.0, -1.0,
+		 1.0,  0.0,
+		 0.0,  0.0,
+
+		-1.0,  0.0,
+		 0.0,  0.0,
+		 0.0,  1.0,
+		-1.0,  1.0,
+
+		 0.0,  0.0,
+		 1.0,  0.0,
+		 1.0,  1.0,
+		 0.0,  1.0,
+	};
+
+	GLuint prog = piglit_build_simple_program(
+		"#version 310 es\n"
+		"\n"
+		"in vec4 piglit_vertex;\n"
+		"out vec3 c;\n"
+		"\n"
+		"const vec3 colors[] = vec3[](\n"
+		"	vec3(1, 0, 0),\n"
+		"	vec3(1, 0, 0),\n"
+		"	vec3(1, 0, 0),\n"
+		"	vec3(1, 0, 0),\n"
+		"\n"
+		"	vec3(0, 1, 0),\n"
+		"	vec3(0, 1, 0),\n"
+		"	vec3(0, 1, 0),\n"
+		"	vec3(0, 1, 0),\n"
+		"\n"
+		"	vec3(0, 0, 1),\n"
+		"	vec3(0, 0, 1),\n"
+		"	vec3(0, 0, 1),\n"
+		"	vec3(0, 0, 1),\n"
+		"\n"
+		"	vec3(1, 1, 0),\n"
+		"	vec3(1, 1, 0),\n"
+		"	vec3(1, 1, 0),\n"
+		"	vec3(1, 1, 0),\n"
+		"\n"
+		"	vec3(1, 0, 1),\n"
+		"	vec3(1, 0, 1),\n"
+		"	vec3(1, 0, 1),\n"
+		"	vec3(1, 0, 1)\n"
+		");\n"
+		"void main() {\n"
+		"       c = colors[gl_VertexID];\n"
+		"	gl_Position = piglit_vertex;\n"
+		"}\n",
+
+		"#version 310 es\n"
+		"in mediump vec3 c;\n"
+		"out mediump vec4 piglit_fragcolor;\n"
+		"\n"
+		"void main() {\n"
+		"	piglit_fragcolor = vec4(c, 1);\n"
+		"}\n");
+
+	glUseProgram(prog);
+
+	GLuint vao;
+	GLuint buf;
+
+	glGenVertexArrays(1, &vao);
+	glBindVertexArray(vao);
+
+	glGenBuffers(1, &buf);
+	glBindBuffer(GL_ARRAY_BUFFER, buf);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts,
+		     GL_STATIC_DRAW);
+
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (void *) 0);
+	glEnableVertexAttribArray(0);
+}