[Mesa-dev] [PATCH] glsl: Modify glsl-max-varyings to test varying packing
Vincent Lejeune
vljn at ovi.com
Wed Feb 1 07:07:16 PST 2012
---
tests/shaders/CMakeLists.gl.txt | 1 +
tests/shaders/glsl-max-varyings-2.c | 413 +++++++++++++++++++++++++++++++++++
2 files changed, 414 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..b020d6c
--- /dev/null
+++ b/tests/shaders/glsl-max-varyings-2.c
@@ -0,0 +1,413 @@
+/*
+ * 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>
+ *
+ */
+
+/** @file glsl-max-varyings.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 unsigned increments[] = { 4, 2, 2, 1 };
+
+/* 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 num_varyings, int data_varying, enum varyings_type type)
+{
+
+ const char * varying_decl[] = {
+ "varying float v%d;\n",
+ "varying vec2 v%d;\n",
+ "varying vec3 v%d;\n",
+ "varying vec4 v%d;\n",
+ };
+
+ GLuint shader;
+ unsigned i;
+ char *code;
+ char temp[2048];
+
+ code = malloc(2048 * 4);
+ code[0] = 0;
+ for (i = 0; i < num_varyings; i++) {
+ sprintf(temp, varying_decl[type], i);
+ strcat(code, temp);
+ }
+
+ 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);
+ i = 0;
+ while (i + increments[type] < num_varyings) {
+ if (i == data_varying) {
+ switch (type) {
+ case FLT:
+ sprintf(temp,
+ " v%d = green.x;\n"
+ " v%d = green.y;\n"
+ " v%d = green.z;\n"
+ " v%d = green.w;\n",
+ i,
+ i + 1,
+ i + 2,
+ i + 3);
+ break;
+ case V2:
+ sprintf(temp,
+ " v%d = green.xy;\n"
+ " v%d = green.zw;\n",
+ i,
+ i + 1);
+ break;
+ case V3:
+ sprintf(temp,
+ " v%d = green.xyz;\n"
+ " v%d.x = green.w;\n",
+ i,
+ i + 1);
+ break;
+ case V4:
+ sprintf(temp, " v%d = green;\n", i);
+ break;
+ }
+ i += increments[type];
+ } else {
+ switch (type) {
+ case FLT:
+ sprintf(temp,
+ " v%d = v_zero;\n", i);
+ break;
+ case V2:
+ sprintf(temp,
+ " v%d.x = v_zero;\n"
+ " v%d.y = v_zero;\n", i, i);
+ break;
+ case V3:
+ sprintf(temp,
+ " v%d.x = v_zero;\n"
+ " v%d.y = v_zero;\n"
+ " v%d.z = v_zero;\n",
+ i, i, i);
+ break;
+ case V4:
+ sprintf(temp,
+ " v%d.x = v_zero;\n"
+ " v%d.y = v_zero;\n"
+ " v%d.z = v_zero;\n"
+ " v%d.w = v_zero;\n",
+ i, i, i, i);
+ break;
+ }
+ i++;
+ }
+ strcat(code, temp);
+
+ }
+
+ sprintf(temp,
+ "}\n"
+ );
+ strcat(code, temp);
+
+ shader = piglit_compile_shader_text(GL_VERTEX_SHADER, code);
+ /* printf("%s\n", code); */
+ free(code);
+
+ return shader;
+}
+
+/* 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 num_varyings, int data_varying, enum varyings_type type)
+{
+ GLuint shader;
+ unsigned i;
+ char temp[2048];
+ char *code;
+
+ const char * varying_decl[] = {
+ "varying float v%d;\n",
+ "varying vec2 v%d;\n",
+ "varying vec3 v%d;\n",
+ "varying vec4 v%d;\n",
+ };
+
+ code = malloc(2048 * 4);
+ code[0] = 0;
+ for (i = 0; i < num_varyings; i++) {
+ sprintf(temp, varying_decl[type], i);
+ strcat(code, temp);
+ }
+
+ sprintf(temp,
+ "uniform float zero;\n"
+ "uniform float one;\n"
+ "void main()\n"
+ "{\n"
+ " vec4 val = vec4(0.0);\n"
+ );
+ strcat(code, temp);
+
+ i = 0;
+ while (i + increments[type] < num_varyings) {
+ if (i == data_varying) {
+ switch (type) {
+ case FLT:
+ sprintf(temp,
+ " val.x += one * v%d;\n"
+ " val.y += one * v%d;\n"
+ " val.z += one * v%d;\n"
+ " val.w += one * v%d;\n",
+ i,
+ i + 1,
+ i + 2,
+ i + 3);
+ break;
+ case V2:
+ sprintf(temp,
+ " val.xy += one * v%d;\n"
+ " val.zw += one * v%d;\n",
+ i,
+ i + 1);
+ break;
+ case V3:
+ sprintf(temp,
+ " val.xyz += one * v%d;\n"
+ " val.w += one * v%d.x;\n",
+ i,
+ i + 1);
+ break;
+ case V4:
+ sprintf(temp,
+ " val += one * v%d;\n",
+ i);
+ break;
+ }
+ i += increments[type];
+ } else {
+ switch (type) {
+ case FLT:
+ sprintf(temp,
+ " val.x += v%d;\n", i);
+ break;
+ case V2:
+ sprintf(temp,
+ " val.xy += v%d;\n", i);
+ break;
+ case V3:
+ sprintf(temp,
+ " val.xyz += v%d;\n", i);
+ break;
+ case V4:
+ sprintf(temp,
+ " val += v%d;\n", i);
+ break;
+ }
+ i++;
+ }
+ strcat(code, temp);
+
+ }
+
+ 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 num_varyings, enum varyings_type type)
+{
+ 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 < num_varyings - increments[type]; data_varying ++) {
+ GLuint prog, vs, fs;
+ GLint loc;
+
+ vs = get_vs(num_varyings, data_varying, type);
+ fs = get_fs(num_varyings, data_varying, type);
+
+ 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(type),
+ 10,
+ 10);
+
+ glDeleteShader(vs);
+ glDeleteShader(fs);
+ glDeleteProgram(prog);
+ }
+}
+
+enum piglit_result
+piglit_display(void)
+{
+ int max_components, type, col;
+ int max_varyings[4];
+ const char* names[] = { "float", "vec2", "vec3", "vec4" };
+ 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;
+ }
+
+ max_varyings[FLT] = max_components / 4;
+ max_varyings[V2] = max_components / 3;
+ max_varyings[V3] = max_components / 2;
+ max_varyings[V4] = max_components;
+
+ glClearColor(0.5, 0.5, 0.5, 0.5);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ for (type = 0; type < 4; type++) {
+ draw(max_varyings[type], type);
+ }
+
+ for (type = 0; type < 4; type++) {
+ for (col = 0; col < max_varyings[type] - increments[type]; col ++) {
+ GLboolean ok;
+ float green[3] = {0.0, 1.0, 0.0};
+
+ ok = piglit_probe_rect_rgb(coord_from_index(col),
+ coord_from_index(type),
+ 10, 10,
+ green);
+ if (!ok) {
+ printf(" Failure with %s varyings used "
+ "in varying index %d\n",
+ names[type], col);
+ 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)
+{
+ if (!GLEW_VERSION_2_0) {
+ printf("Requires OpenGL 2.0\n");
+ piglit_report_result(PIGLIT_SKIP);
+ }
+
+ printf("Vertical axis: Increasing numbers of varyings.\n");
+ printf("Horizontal axis: Which of the varyings contains the color.\n");
+}
+
+
--
1.7.7
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