+#include <epoxy/gl.h>
+#include <assert.h>
+#include <stddef.h>
+#include <algorithm>
+#include <string>
+
#include "init.h"
-#include "opengl.h"
+#include "resource_pool.h"
#include "util.h"
+using namespace std;
+
+namespace movit {
+
bool movit_initialized = false;
+MovitDebugLevel movit_debug_level = MOVIT_DEBUG_ON;
float movit_texel_subpixel_precision;
+bool movit_timer_queries_supported, movit_compute_shaders_supported;
+int movit_num_wrongly_rounded;
+MovitShaderModel movit_shader_model;
+
+// The rules for objects with nontrivial constructors in static scope
+// are somewhat convoluted, and easy to mess up. We simply have a
+// pointer instead (and never care to clean it up).
+string *movit_data_directory = nullptr;
namespace {
void measure_texel_subpixel_precision()
{
- static const unsigned width = 1024;
+ ResourcePool resource_pool;
+ static const unsigned width = 4096;
// Generate a destination texture to render to, and an FBO.
GLuint dst_texnum, fbo;
check_error();
glBindTexture(GL_TEXTURE_2D, dst_texnum);
check_error();
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, width, 1, 0, GL_RGBA, GL_FLOAT, nullptr);
check_error();
glGenFramebuffers(1, &fbo);
// Now generate a simple texture that's just [0,1].
GLuint src_texnum;
float texdata[] = { 0, 1 };
- glGenTextures(1, &dst_texnum);
- check_error();
- glBindTexture(GL_TEXTURE_1D, dst_texnum);
+ glGenTextures(1, &src_texnum);
check_error();
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glBindTexture(GL_TEXTURE_2D, src_texnum);
check_error();
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
check_error();
- glTexImage1D(GL_TEXTURE_1D, 0, GL_LUMINANCE16F_ARB, 2, 0, GL_LUMINANCE, GL_FLOAT, texdata);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
check_error();
- glEnable(GL_TEXTURE_1D);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_R16F, 2, 1, 0, GL_RED, GL_FLOAT, texdata);
check_error();
// Basic state.
glViewport(0, 0, width, 1);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0);
-
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
+ vector<string> frag_shader_outputs;
+ GLuint glsl_program_num = resource_pool.compile_glsl_program(
+ read_version_dependent_file("vs", "vert"),
+ read_version_dependent_file("texture1d", "frag"),
+ frag_shader_outputs);
+ glUseProgram(glsl_program_num);
+ check_error();
+ glUniform1i(glGetUniformLocation(glsl_program_num, "tex"), 0); // Bind the 2D sampler.
check_error();
// Draw the texture stretched over a long quad, interpolating it out.
// Note that since the texel center is in (0.5), we need to adjust the
// texture coordinates in order not to get long stretches of (1,1,1,...)
// at the start and (...,0,0,0) at the end.
- glBegin(GL_QUADS);
+ float vertices[] = {
+ 0.0f, 1.0f,
+ 0.0f, 0.0f,
+ 1.0f, 1.0f,
+ 1.0f, 0.0f
+ };
+ float texcoords[] = {
+ 0.25f, 0.0f,
+ 0.25f, 0.0f,
+ 0.75f, 0.0f,
+ 0.75f, 0.0f
+ };
- glTexCoord1f(0.25f);
- glVertex2f(0.0f, 0.0f);
-
- glTexCoord1f(0.75f);
- glVertex2f(1.0f, 0.0f);
-
- glTexCoord1f(0.75f);
- glVertex2f(1.0f, 1.0f);
+ GLuint vao;
+ glGenVertexArrays(1, &vao);
+ check_error();
+ glBindVertexArray(vao);
+ check_error();
- glTexCoord1f(0.25f);
- glVertex2f(0.0f, 1.0f);
+ GLuint position_vbo = fill_vertex_attribute(glsl_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
+ GLuint texcoord_vbo = fill_vertex_attribute(glsl_program_num, "texcoord", 2, GL_FLOAT, sizeof(texcoords), texcoords);
- glEnd();
+ glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
check_error();
- glDisable(GL_TEXTURE_1D);
+ cleanup_vertex_attribute(glsl_program_num, "position", position_vbo);
+ cleanup_vertex_attribute(glsl_program_num, "texcoord", texcoord_vbo);
+
+ glUseProgram(0);
check_error();
// Now read the data back and see what the card did.
// (We only look at the red channel; the others will surely be the same.)
// We assume a linear ramp; anything else will give sort of odd results here.
- float out_data[width];
- glReadPixels(0, 0, width, 1, GL_RED, GL_FLOAT, out_data);
+ float out_data[width * 4];
+ glReadPixels(0, 0, width, 1, GL_RGBA, GL_FLOAT, out_data);
check_error();
float biggest_jump = 0.0f;
for (unsigned i = 1; i < width; ++i) {
- assert(out_data[i] >= out_data[i - 1]);
- biggest_jump = std::max(biggest_jump, out_data[i] - out_data[i - 1]);
+ assert(out_data[i * 4] >= out_data[(i - 1) * 4]);
+ biggest_jump = max(biggest_jump, out_data[i * 4] - out_data[(i - 1) * 4]);
}
+ assert(biggest_jump > 0.0);
movit_texel_subpixel_precision = biggest_jump;
// Clean up.
- glBindTexture(GL_TEXTURE_1D, 0);
+ glBindTexture(GL_TEXTURE_2D, 0);
+ check_error();
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ check_error();
+ glDeleteFramebuffers(1, &fbo);
+ check_error();
+ glDeleteTextures(1, &dst_texnum);
+ check_error();
+ glDeleteTextures(1, &src_texnum);
+ check_error();
+
+ resource_pool.release_glsl_program(glsl_program_num);
+ glDeleteVertexArrays(1, &vao);
+ check_error();
+}
+
+void measure_roundoff_problems()
+{
+ ResourcePool resource_pool;
+
+ // Generate a destination texture to render to, and an FBO.
+ GLuint dst_texnum, fbo;
+
+ glGenTextures(1, &dst_texnum);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, dst_texnum);
+ check_error();
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 512, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+ check_error();
+
+ glGenFramebuffers(1, &fbo);
+ check_error();
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ check_error();
+ glFramebufferTexture2D(
+ GL_FRAMEBUFFER,
+ GL_COLOR_ATTACHMENT0,
+ GL_TEXTURE_2D,
+ dst_texnum,
+ 0);
+ check_error();
+
+ // Now generate a texture where every value except the last should be
+ // rounded up to the next one. However, there are cards (in highly
+ // common use) that can't do this right, for unknown reasons.
+ GLuint src_texnum;
+ float texdata[512];
+ for (int i = 0; i < 256; ++i) {
+ texdata[i * 2 + 0] = (i + 0.48) / 255.0;
+ texdata[i * 2 + 1] = (i + 0.52) / 255.0;
+ }
+ glGenTextures(1, &src_texnum);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, src_texnum);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ check_error();
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_R32F, 512, 1, 0, GL_RED, GL_FLOAT, texdata);
+ check_error();
+
+ // Basic state.
+ glDisable(GL_BLEND);
+ check_error();
+ glDisable(GL_DEPTH_TEST);
+ check_error();
+ glDepthMask(GL_FALSE);
+ check_error();
+
+ glViewport(0, 0, 512, 1);
+
+ vector<string> frag_shader_outputs;
+ GLuint glsl_program_num = resource_pool.compile_glsl_program(
+ read_version_dependent_file("vs", "vert"),
+ read_version_dependent_file("texture1d", "frag"),
+ frag_shader_outputs);
+ glUseProgram(glsl_program_num);
+ check_error();
+ glUniform1i(glGetUniformLocation(glsl_program_num, "tex"), 0); // Bind the 2D sampler.
+
+ // Draw the texture stretched over a long quad, interpolating it out.
+ float vertices[] = {
+ 0.0f, 1.0f,
+ 0.0f, 0.0f,
+ 1.0f, 1.0f,
+ 1.0f, 0.0f
+ };
+
+ GLuint vao;
+ glGenVertexArrays(1, &vao);
+ check_error();
+ glBindVertexArray(vao);
+ check_error();
+
+ GLuint position_vbo = fill_vertex_attribute(glsl_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
+ GLuint texcoord_vbo = fill_vertex_attribute(glsl_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices); // Same data.
+
+ glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+ check_error();
+
+ cleanup_vertex_attribute(glsl_program_num, "position", position_vbo);
+ cleanup_vertex_attribute(glsl_program_num, "texcoord", texcoord_vbo);
+
+ glUseProgram(0);
+ check_error();
+
+ // Now read the data back and see what the card did. (Ignore the last value.)
+ // (We only look at the red channel; the others will surely be the same.)
+ unsigned char out_data[512 * 4];
+ glReadPixels(0, 0, 512, 1, GL_RGBA, GL_UNSIGNED_BYTE, out_data);
+ check_error();
+
+ int wrongly_rounded = 0;
+ for (unsigned i = 0; i < 255; ++i) {
+ if (out_data[(i * 2 + 0) * 4] != i) {
+ ++wrongly_rounded;
+ }
+ if (out_data[(i * 2 + 1) * 4] != i + 1) {
+ ++wrongly_rounded;
+ }
+ }
+
+ movit_num_wrongly_rounded = wrongly_rounded;
+
+ // Clean up.
+ glBindTexture(GL_TEXTURE_2D, 0);
check_error();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
check_error();
check_error();
glDeleteTextures(1, &src_texnum);
check_error();
+
+ resource_pool.release_glsl_program(glsl_program_num);
+ glDeleteVertexArrays(1, &vao);
+ check_error();
+}
+
+bool check_extensions()
+{
+ // GLES generally doesn't use extensions as actively as desktop OpenGL.
+ // For now, we say that for GLES, we require GLES 3, which has everything
+ // we need.
+ if (!epoxy_is_desktop_gl()) {
+ if (epoxy_gl_version() >= 30) {
+ return true;
+ } else {
+ fprintf(stderr, "Movit system requirements: GLES version %.1f is too old (GLES 3.0 needed).\n",
+ 0.1f * epoxy_gl_version());
+ fprintf(stderr, "Movit initialization failed.\n");
+ return false;
+ }
+ }
+
+ if (epoxy_gl_version() < 30) {
+ fprintf(stderr, "Movit system requirements: OpenGL version %.1f is too old (OpenGL 3.0 needed).\n",
+ 0.1f * epoxy_gl_version());
+ fprintf(stderr, "Movit initialization failed.\n");
+ return false;
+ }
+
+ // The user can specify that they want a timing report for each
+ // phase in an effect chain. However, that depends on this extension;
+ // without it, we do cannot even create the query objects.
+ movit_timer_queries_supported =
+ (epoxy_gl_version() >= 33 || epoxy_has_gl_extension("GL_ARB_timer_query"));
+
+ // Certain effects have compute shader implementations, which may be
+ // more efficient than the normal fragment shader versions.
+ // GLSL 3.10 supposedly also has compute shaders, but I haven't tested them,
+ // so we require desktop OpenGL.
+ movit_compute_shaders_supported =
+ (epoxy_is_desktop_gl() &&
+ (epoxy_gl_version() >= 43 ||
+ (epoxy_has_gl_extension("GL_ARB_compute_shader") &&
+ epoxy_has_gl_extension("GL_ARB_shader_image_load_store") &&
+ epoxy_has_gl_extension("GL_ARB_shader_image_size"))));
+
+ return true;
+}
+
+double get_glsl_version()
+{
+ char *glsl_version_str = strdup((const char *)glGetString(GL_SHADING_LANGUAGE_VERSION));
+
+ // Skip past the first period.
+ char *ptr = strchr(glsl_version_str, '.');
+ assert(ptr != nullptr);
+ ++ptr;
+
+ // Now cut the string off at the next period or space, whatever comes first
+ // (unless the string ends first).
+ while (*ptr && *ptr != '.' && *ptr != ' ') {
+ ++ptr;
+ }
+ *ptr = '\0';
+
+ // Now we have something on the form X.YY. We convert it to a float, and hope
+ // that if it's inexact (e.g. 1.30), atof() will round the same way the
+ // compiler will.
+ std::istringstream locale_convert(glsl_version_str);
+ locale_convert.imbue(std::locale("C"));
+ double glsl_version;
+ locale_convert >> glsl_version;
+ free(glsl_version_str);
+
+ return glsl_version;
+}
+
+void APIENTRY debug_callback(GLenum source,
+ GLenum type,
+ GLuint id,
+ GLenum severity,
+ GLsizei length,
+ const char *message,
+ const void *userParam)
+#ifdef __GNUC__
+ __attribute__((unused))
+#endif
+;
+
+void APIENTRY debug_callback(GLenum source,
+ GLenum type,
+ GLuint id,
+ GLenum severity,
+ GLsizei length,
+ const char *message,
+ const void *userParam)
+{
+ printf("Debug: %s\n", message);
}
} // namespace
-void init_movit()
+bool init_movit(const string& data_directory, MovitDebugLevel debug_level)
{
if (movit_initialized) {
- return;
+ return true;
}
+ movit_data_directory = new string(data_directory);
+ movit_debug_level = debug_level;
+
// geez
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ glDisable(GL_DITHER);
+
+ // You can turn this on if you want detailed debug messages from the driver.
+ // You should probably also ask for a debug context (see gtest_sdl_main.cpp),
+ // or you might not get much data back.
+ // glDebugMessageCallbackARB(callback, nullptr);
+ // glDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, 0, GL_TRUE);
+
+ if (!check_extensions()) {
+ return false;
+ }
+
+ // Find out what shader model we should compile for.
+ // We need at least 1.30, due to use of (among others) integers.
+ if (epoxy_is_desktop_gl()) {
+ if (get_glsl_version() < 1.30f) {
+ fprintf(stderr, "Movit system requirements: Needs at least GLSL version 1.30 (has version %.1f)\n",
+ get_glsl_version());
+ return false;
+ }
+ if (get_glsl_version() < 1.50f) {
+ movit_shader_model = MOVIT_GLSL_130;
+ } else {
+ // Note: All of our 1.50 shaders are identical to our 1.30 shaders,
+ // but OS X does not support 1.30; only 1.10 (which we don't support
+ // anymore) and 1.50 (and then only with core contexts). So we keep
+ // a second set of shaders around whose only difference is the different
+ // #version declaration.
+ movit_shader_model = MOVIT_GLSL_150;
+ }
+ } else {
+ movit_shader_model = MOVIT_ESSL_300;
+ }
measure_texel_subpixel_precision();
+ measure_roundoff_problems();
movit_initialized = true;
+ return true;
}
+
+} // namespace movit
projects / movit / blobdiff