[Piglit] [PATCH] varying: Checks if driver can handle MAX_VARYING_FLOATS in mixed float, vec*.

Vincent Lejeune vljn at ovi.com
Wed Feb 8 12:20:52 PST 2012


---
 tests/shaders/CMakeLists.gl.txt     |    1 +
 tests/shaders/glsl-max-varyings-2.c |  452 +++++++++++++++++++++++++++++++++++
 2 files changed, 453 insertions(+), 0 deletions(-)
 create mode 100644 tests/shaders/glsl-max-varyings-2.c

diff --git a/tests/shaders/CMakeLists.gl.txt b/tests/shaders/CMakeLists.gl.txt
index 9d72260..b00219e 100644
--- a/tests/shaders/CMakeLists.gl.txt
+++ b/tests/shaders/CMakeLists.gl.txt
@@ -143,6 +143,7 @@ add_executable (vp-ignore-input vp-ignore-input.c)
 add_executable (glsl-empty-vs-no-fs glsl-empty-vs-no-fs.c)
 add_executable (glsl-mat-attribute glsl-mat-attribute.c)
 add_executable (glsl-max-varyings glsl-max-varyings.c)
+add_executable (glsl-max-varyings-2 glsl-max-varyings-2.c)
 add_executable (glsl-useprogram-displaylist glsl-useprogram-displaylist.c)
 add_executable (glsl-routing glsl-routing.c)
 add_executable (shader_runner shader_runner.c)
diff --git a/tests/shaders/glsl-max-varyings-2.c b/tests/shaders/glsl-max-varyings-2.c
new file mode 100644
index 0000000..45e7396
--- /dev/null
+++ b/tests/shaders/glsl-max-varyings-2.c
@@ -0,0 +1,452 @@
+/*
+ * Copyright © 2010 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric at anholt.net>
+ *    Vincent Lejeune <vljn at ovi.com>
+ *
+ */
+
+/** @file glsl-max-varyings-2.c
+ *
+ * Tests whether GL_MAX_VARYING_FLOATS varying components can be used when packed
+ * as vec4, vec3, vec2, or float. Drivers have to pack varyings to pass this test.
+ */
+
+#include "piglit-util.h"
+
+#define MAX_VARYING 128
+
+/* 10x10 rectangles with 2 pixels of pad.  Deal with up to 32 varyings. */
+int piglit_width = (2 + MAX_VARYING * 12), piglit_height = (2 + MAX_VARYING * 12);
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
+
+
+enum varyings_type {
+   FLT = 0,
+   V2 = 1,
+   V3 = 2,
+   V4 = 3
+};
+
+const char* names[] = { "float", "vec2", "vec3", "vec4" };
+
+char temp[2048];
+
+float ratio[4];
+unsigned amounts[4];
+int max_components;
+
+static void generate_varyings_decl(char* code)
+{
+
+   unsigned index = 0, i;
+
+   static const char * varying_decl[] = {
+	"varying float v%d;\n",
+	"varying vec2 v%d;\n",
+	"varying vec3 v%d;\n",
+	"varying vec4 v%d;\n",
+   };
+      
+   for (i = 0; i < amounts[FLT]; i++) {
+	sprintf(temp, varying_decl[FLT], index);
+	strcat(code, temp);
+	index ++;
+   }
+   
+   for (i = 0; i < amounts[V2]; i++) {
+	sprintf(temp, varying_decl[V2], index);
+	strcat(code, temp);
+	index ++;
+   }
+   
+   for (i = 0; i < amounts[V3]; i++) {
+	sprintf(temp, varying_decl[V3], index);
+	strcat(code, temp);
+	index ++;
+   }
+   
+   for (i = 0; i < amounts[V4]; i++) {
+	sprintf(temp, varying_decl[V4], index);
+	strcat(code, temp);
+	index ++;
+   }
+   
+   return;
+}
+
+static void
+get_varying_and_component_from_index(unsigned index, unsigned *varying, unsigned *component)
+{
+   // Accessing a varying float
+   if (index < amounts[FLT]) {
+	*varying = index;
+	*component = 4;
+	return;
+   }
+   
+   // Accessing a component of a vec2
+   if (index < amounts[FLT] + 2 *amounts[V2]) {
+	unsigned index_from_v2_start = index - amounts[FLT];
+	*varying = index_from_v2_start / 2;
+	*varying += amounts[FLT];
+	*component = index_from_v2_start % 2;
+	return;
+   }
+   
+   // Accessing a component of a vec3
+   if (index < amounts[FLT] + 2 *amounts[V2] + 3 * amounts [V3]) {
+	unsigned index_from_v3_start = index - amounts[FLT] - 2 * amounts[V2];
+	*varying = index_from_v3_start / 3;
+	*varying += amounts[FLT] + amounts[V2];
+	*component = index_from_v3_start % 3;
+	return;
+   }
+   
+   // Accessing a component of a vec4
+   if (index < amounts[FLT] + 2 * amounts[V2] + 3 *amounts[V3] + 4 * amounts[V4]) {
+	unsigned index_from_v4_start = index - amounts[FLT] - 2 * amounts[V2] - 3 * amounts[V3];
+	*varying = index_from_v4_start / 4;
+	*varying += amounts[FLT] + amounts[V2] + amounts[V4];
+	*component = index_from_v4_start % 4;
+	return;
+   }
+}
+
+static void
+write_zero(char *code, unsigned index, int component) {
+   
+   switch (component) {
+   case 0:
+	sprintf(temp,
+	        "	v%d.x = v_zero;\n", index);
+	break;
+   case 1:
+	sprintf(temp,
+	        "	v%d.y = v_zero;\n", index);
+	break;
+   case 2:
+	sprintf(temp,
+	        "	v%d.z = v_zero;\n", index);
+	break;
+   case 3:
+	sprintf(temp,
+	        "	v%d.w = v_zero;\n", index);
+	break;
+   default:
+	sprintf(temp,
+	        "	v%d = v_zero;\n", index);
+	break;
+   }
+   
+   strcat(code, temp);
+}
+
+static void
+write_green_component(char *code, unsigned index, int component_dst, unsigned component_src) {
+   
+   static const char * component_suffix[] = { ".x", ".y", ".z", ".w", ""};
+   sprintf(temp,
+           "	v%d%s = green%s;\n", index, component_suffix[component_dst], component_suffix[component_src]);
+   strcat(code, temp);
+}
+
+/* Generate a VS that writes to num_varyings vec4s, and put
+ * interesting data in data_varying with 0.0 everywhere else.
+ */
+static GLint get_vs(int data_varying)
+{
+	GLuint shader;
+	unsigned i, j;
+	char *code;
+
+	code =  malloc(2048 * 4);
+	code[0] = 0;
+	
+	generate_varyings_decl(code);
+
+	sprintf(temp,
+		"attribute vec4 green;\n"
+		"attribute float v_zero;\n"
+		"void main()\n"
+		"{\n"
+		"	gl_Position = (gl_ModelViewProjectionMatrix * \n"
+		"			gl_Vertex);\n"
+		);
+	strcat(code, temp);
+
+	for (i = 0; i < data_varying; i++) {
+	   unsigned index, component;
+	   get_varying_and_component_from_index(i, &index, &component);
+	   write_zero(code, index, component);
+	}
+	
+	j = 0;
+	for (i = data_varying; i < data_varying + 4; i++) {
+	   unsigned index, component;
+	   get_varying_and_component_from_index(i, &index, &component);
+	   write_green_component(code, index, component, j);
+	   j++;
+	}
+	
+	for (i = data_varying + 4; i < max_components - 4; i++) {
+	   unsigned index, component;
+	   get_varying_and_component_from_index(i, &index, &component);
+	   write_zero(code, index, component);
+	}
+
+	sprintf(temp,
+		"}\n"
+		);
+	strcat(code, temp);
+
+	shader = piglit_compile_shader_text(GL_VERTEX_SHADER, code);
+      /* printf("%s\n", code); */
+      free(code);
+
+	return shader;
+}
+
+static void
+read_to_val_component(char *code, unsigned index, int component_src, unsigned component_dst, const char *coeff) {
+   
+   static const char * component_suffix[] = { ".x", ".y", ".z", ".w", ""};
+   sprintf(temp,
+           "	val%s += %s * v%d%s;\n", component_suffix[component_dst], coeff, index, component_suffix[component_src]);
+   strcat(code, temp);
+}
+
+/* Generate a FS that does operations on num_varyings, yet makes only
+ * data_varying contribute to the output.
+ *
+ * We could make a single FS per num_varyings that did this by using a
+ * uniform for data_varying and some multiplication by comparisons
+ * (see glsl-routing for an example), but since we're linking a new
+ * shader each time anyway, this produces a simpler FS to read and
+ * verify.
+ */
+static GLint get_fs(int data_varying)
+{
+	GLuint shader;
+	unsigned i, j;
+	char temp[2048];
+	char *code;
+
+	code = malloc(2048 * 4);
+	code[0] = 0;
+	
+	generate_varyings_decl(code);
+
+
+	sprintf(temp,
+		"uniform float zero;\n"
+		"uniform float one;\n"
+		"void main()\n"
+		"{\n"
+		"	vec4 val = vec4(0.0);\n"
+		);
+	strcat(code, temp);
+
+	for (i = 0; i < data_varying; i++) {
+	   unsigned index, component;
+	   get_varying_and_component_from_index(i, &index, &component);
+	   read_to_val_component(code, index, component, i % 4, "zero");
+	}
+	
+	j = 0;
+	for (i = data_varying; i < data_varying + 4; i++) {
+	   unsigned index, component;
+	   get_varying_and_component_from_index(i, &index, &component);
+	   read_to_val_component(code, index, component, j, "one");
+	   j++;
+	}
+	
+	for (i = data_varying + 4; i < max_components - 4; i++) {
+	   unsigned index, component;
+	   get_varying_and_component_from_index(i, &index, &component);
+	   read_to_val_component(code, index, component, i % 4, "zero");
+	}
+
+	sprintf(temp,
+		"	gl_FragColor = val;\n"
+		"}\n"
+		);
+	strcat(code, temp);
+      /* printf("%s\n", code);  */
+	shader = piglit_compile_shader_text(GL_FRAGMENT_SHADER, code);
+	free(code);
+
+	return shader;
+}
+
+static int
+coord_from_index(int index)
+{
+	return 2 + 12 * index;
+}
+
+static void
+draw()
+{
+	int data_varying;
+	float green[4][4] = { {0.0, 1.0, 0.0, 0.0},
+			      {0.0, 1.0, 0.0, 0.0},
+			      {0.0, 1.0, 0.0, 0.0},
+			      {0.0, 1.0, 0.0, 0.0} };
+
+	glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float),
+			      green);
+	glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 4 * sizeof(float),
+			      green);
+	glEnableVertexAttribArray(1);
+	glEnableVertexAttribArray(2);
+
+	for (data_varying = 0; data_varying < max_components - 4; data_varying ++) {
+		GLuint prog, vs, fs;
+		GLint loc;
+
+            vs = get_vs(data_varying);
+            fs = get_fs(data_varying);
+
+		prog = glCreateProgram();
+		glAttachShader(prog, vs);
+		glAttachShader(prog, fs);
+
+		glBindAttribLocation(prog, 1, "green");
+		glBindAttribLocation(prog, 2, "v_zero");
+
+		glLinkProgram(prog);
+		if (!piglit_link_check_status(prog))
+			piglit_report_result(PIGLIT_FAIL);
+
+		glUseProgram(prog);
+
+		loc = glGetUniformLocation(prog, "zero");
+		if (loc != -1) /* not used for num_varyings == 1 */
+			glUniform1f(loc, 0.0);
+
+		loc = glGetUniformLocation(prog, "one");
+		assert(loc != -1); /* should always be used */
+		glUniform1f(loc, 1.0);
+
+
+		piglit_draw_rect(coord_from_index(data_varying),
+				 coord_from_index(0),
+				 10,
+				 10);
+
+		glDeleteShader(vs);
+		glDeleteShader(fs);
+		glDeleteProgram(prog);
+	}
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	int col;
+	GLboolean pass = GL_TRUE, warned = GL_FALSE;
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	glGetIntegerv(GL_MAX_VARYING_FLOATS, &max_components);
+
+	printf("GL_MAX_VARYING_FLOATS = %i\n", max_components);
+
+	if (max_components > MAX_VARYING) {
+		printf("test not designed to handle >%d varying vec4s.\n"
+		       "(implementation reports %d components)\n",
+		       max_components, MAX_VARYING);
+		max_components = MAX_VARYING;
+		warned = GL_TRUE;
+	}
+	
+	amounts[FLT] = max_components * ratio[FLT];
+	amounts[V2] = (max_components * ratio[V2]) / 2;
+	amounts[V3] = (max_components * ratio[V3]) / 4;
+	amounts[V4] = (max_components * ratio[V4]) /4;
+	
+	max_components = amounts[FLT] + amounts[V2] + amounts[V3] + amounts[V4];
+
+	glClearColor(0.5, 0.5, 0.5, 0.5);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	draw();
+
+	   for (col = 0; col < max_components - 4; col ++) {
+		GLboolean ok;
+		float green[3] = {0.0, 1.0, 0.0};
+
+		ok = piglit_probe_rect_rgb(coord_from_index(col),
+		                           coord_from_index(0),
+		                           10, 10,
+		                           green);
+		if (!ok) {
+		   unsigned index, component;
+		   get_varying_and_component_from_index(col, &index, &component);
+		   printf("  Failure with v%d varyings\n", index);
+		   pass = GL_FALSE;
+		   break;
+		}
+	   }
+
+	glutSwapBuffers();
+
+	if (!pass)
+		return PIGLIT_FAIL;
+	if (warned)
+		return PIGLIT_WARN;
+	else
+		return PIGLIT_PASS;
+}
+
+
+void piglit_init(int argc, char **argv)
+{
+   unsigned i;
+
+	if (!GLEW_VERSION_2_0) {
+		printf("Requires OpenGL 2.0\n");
+		piglit_report_result(PIGLIT_SKIP);
+	}
+
+   if (argc < 5) {
+	fprintf(stderr, "Not enough args.\n");
+	exit(1);
+   }
+   
+   for (i = 1; i < argc; i++) {
+	sscanf(argv[i], "%f",&ratio[i - 1]);
+	if (ratio[i - 1] < 0) {
+	   fprintf(stderr, "Ratio must be positive.\n");
+	   exit(1);
+	}
+   }
+   
+   if (ratio[FLT] + ratio[V2] + ratio[V3] + ratio[V4] > 1.0) {
+   	   fprintf(stderr, "Ratio are not normalised.\n");
+	   exit(1);
+   }
+}
+
+
-- 
1.7.7



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