#include "saturation_effect.h"
#include "mirror_effect.h"
#include "vignette_effect.h"
+#include "blur_effect.h"
EffectChain::EffectChain(unsigned width, unsigned height)
: width(width), height(height), use_srgb_texture_format(false), finalized(false) {}
return new MirrorEffect();
case EFFECT_VIGNETTE:
return new VignetteEffect();
+ case EFFECT_BLUR:
+ return new BlurEffect();
}
assert(false);
}
normalize_to_srgb();
}
- // not handled yet
- assert(!effect->needs_many_samples());
- assert(!effect->needs_mipmaps());
-
effects.push_back(effect);
return effect;
}
return output;
}
-void EffectChain::finalize()
+EffectChain::Phase EffectChain::compile_glsl_program(unsigned start_index, unsigned end_index)
{
- if (current_color_space != output_format.color_space) {
- ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
- colorspace_conversion->set_int("source_space", current_color_space);
- colorspace_conversion->set_int("destination_space", output_format.color_space);
- effects.push_back(colorspace_conversion);
- current_color_space = output_format.color_space;
- }
-
- if (current_gamma_curve != output_format.gamma_curve) {
- if (current_gamma_curve != GAMMA_LINEAR) {
- normalize_to_linear_gamma();
- }
- assert(current_gamma_curve == GAMMA_LINEAR);
- GammaCompressionEffect *gamma_conversion = new GammaCompressionEffect();
- gamma_conversion->set_int("destination_curve", output_format.gamma_curve);
- effects.push_back(gamma_conversion);
- current_gamma_curve = output_format.gamma_curve;
- }
-
+ bool input_needs_mipmaps = false;
std::string frag_shader = read_file("header.frag");
- for (unsigned i = 0; i < effects.size(); ++i) {
+ for (unsigned i = start_index; i < end_index; ++i) {
char effect_id[256];
sprintf(effect_id, "eff%d", i);
frag_shader += "#undef LAST_INPUT\n";
frag_shader += std::string("#define LAST_INPUT ") + effect_id + "\n";
frag_shader += "\n";
+
+ input_needs_mipmaps |= effects[i]->needs_mipmaps();
}
frag_shader.append(read_file("footer.frag"));
printf("%s\n", frag_shader.c_str());
- glsl_program_num = glCreateProgram();
+ GLuint glsl_program_num = glCreateProgram();
GLuint vs_obj = compile_shader(read_file("vs.vert"), GL_VERTEX_SHADER);
GLuint fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER);
glAttachShader(glsl_program_num, vs_obj);
glLinkProgram(glsl_program_num);
check_error();
- // Translate the format to OpenGL's enums.
+ Phase phase;
+ phase.glsl_program_num = glsl_program_num;
+ phase.input_needs_mipmaps = input_needs_mipmaps;
+ phase.start = start_index;
+ phase.end = end_index;
+
+ return phase;
+}
+
+void EffectChain::finalize()
+{
+ // Add normalizers to get the output format right.
+ if (current_color_space != output_format.color_space) {
+ ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
+ colorspace_conversion->set_int("source_space", current_color_space);
+ colorspace_conversion->set_int("destination_space", output_format.color_space);
+ effects.push_back(colorspace_conversion);
+ current_color_space = output_format.color_space;
+ }
+ if (current_gamma_curve != output_format.gamma_curve) {
+ if (current_gamma_curve != GAMMA_LINEAR) {
+ normalize_to_linear_gamma();
+ }
+ assert(current_gamma_curve == GAMMA_LINEAR);
+ GammaCompressionEffect *gamma_conversion = new GammaCompressionEffect();
+ gamma_conversion->set_int("destination_curve", output_format.gamma_curve);
+ effects.push_back(gamma_conversion);
+ current_gamma_curve = output_format.gamma_curve;
+ }
+
+ // Construct the GLSL programs. We end a program every time we come
+ // to an effect marked as "needs many samples" (ie. "please let me
+ // sample directly from a texture, with no arithmetic in-between"),
+ // and of course at the end.
+ unsigned start = 0;
+ for (unsigned i = 0; i < effects.size(); ++i) {
+ if (effects[i]->needs_many_samples() && i != start) {
+ phases.push_back(compile_glsl_program(start, i));
+ start = i;
+ }
+ }
+ phases.push_back(compile_glsl_program(start, effects.size()));
+
+ // If we have more than one phase, we need intermediate render-to-texture.
+ // Construct an FBO, and then as many textures as we need.
+ if (phases.size() > 1) {
+ glGenFramebuffers(1, &fbo);
+
+ unsigned num_textures = std::max<int>(phases.size() - 1, 2);
+ glGenTextures(num_textures, temp_textures);
+
+ unsigned char *empty = new unsigned char[width * height * 4];
+ memset(empty, 0, width * height * 4);
+ for (unsigned i = 0; i < num_textures; ++i) {
+ glBindTexture(GL_TEXTURE_2D, temp_textures[i]);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ check_error();
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, empty);
+ check_error();
+ }
+ delete[] empty;
+ }
+
+ // Translate the input format to OpenGL's enums.
GLenum internal_format;
if (use_srgb_texture_format) {
internal_format = GL_SRGB8;
assert(false);
}
- // Create PBO to hold the texture, and then the texture itself.
+ // Create PBO to hold the texture holding the input image, and then the texture itself.
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 2);
check_error();
glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, width * height * bytes_per_pixel, NULL, GL_STREAM_DRAW);
check_error();
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, GL_UNSIGNED_BYTE, BUFFER_OFFSET(0));
check_error();
- glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
check_error();
-
- glUseProgram(glsl_program_num);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
check_error();
-
+ glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
check_error();
- glUniform1i(glGetUniformLocation(glsl_program_num, "input_tex"), 0);
-
- for (unsigned i = 0; i < effects.size(); ++i) {
- char effect_id[256];
- sprintf(effect_id, "eff%d", i);
- effects[i]->set_uniforms(glsl_program_num, effect_id);
- }
+ // Basic state.
glDisable(GL_BLEND);
check_error();
glDisable(GL_DEPTH_TEST);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
- glBegin(GL_QUADS);
+ if (phases.size() > 1) {
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ check_error();
+ }
+
+ for (unsigned phase = 0; phase < phases.size(); ++phase) {
+ // Set up inputs and outputs for this phase.
+ if (phase == 0) {
+ // First phase reads from the input texture (which is already bound).
+ } else {
+ glBindTexture(GL_TEXTURE_2D, temp_textures[(phase + 1) % 2]);
+ check_error();
+ }
+ if (phases[phase].input_needs_mipmaps) {
+ glGenerateMipmap(GL_TEXTURE_2D);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+ check_error();
+ } else {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ check_error();
+ }
- glTexCoord2f(0.0f, 1.0f);
- glVertex2f(0.0f, 0.0f);
+ if (phase == phases.size() - 1) {
+ // Last phase goes directly to the screen.
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ check_error();
+ } else {
+ glFramebufferTexture2D(
+ GL_FRAMEBUFFER,
+ GL_COLOR_ATTACHMENT0,
+ GL_TEXTURE_2D,
+ temp_textures[phase % 2],
+ 0);
+ }
- glTexCoord2f(1.0f, 1.0f);
- glVertex2f(1.0f, 0.0f);
+ // We have baked an upside-down transform into the quad coordinates,
+ // since the typical graphics program will have the origin at the upper-left,
+ // while OpenGL uses lower-left. In the next ones, however, the origin
+ // is all right, and we need to reverse that.
+ if (phase == 1) {
+ glTranslatef(0.0f, 1.0f, 0.0f);
+ glScalef(1.0f, -1.0f, 1.0f);
+ }
- glTexCoord2f(1.0f, 0.0f);
- glVertex2f(1.0f, 1.0f);
+ // Give the required parameters to all the effects.
+ glUseProgram(phases[phase].glsl_program_num);
+ check_error();
- glTexCoord2f(0.0f, 0.0f);
- glVertex2f(0.0f, 1.0f);
+ glUniform1i(glGetUniformLocation(phases[phase].glsl_program_num, "input_tex"), 0);
+ check_error();
- glEnd();
- check_error();
+ unsigned sampler_num = 1;
+ for (unsigned i = phases[phase].start; i < phases[phase].end; ++i) {
+ char effect_id[256];
+ sprintf(effect_id, "eff%d", i);
+ effects[i]->set_uniforms(phases[phase].glsl_program_num, effect_id, &sampler_num);
+ }
+
+ // Now draw!
+ glBegin(GL_QUADS);
+
+ glTexCoord2f(0.0f, 1.0f);
+ glVertex2f(0.0f, 0.0f);
+
+ glTexCoord2f(1.0f, 1.0f);
+ glVertex2f(1.0f, 0.0f);
+
+ glTexCoord2f(1.0f, 0.0f);
+ glVertex2f(1.0f, 1.0f);
+
+ glTexCoord2f(0.0f, 0.0f);
+ glVertex2f(0.0f, 1.0f);
+
+ glEnd();
+ check_error();
+
+ // HACK
+ glActiveTexture(GL_TEXTURE0);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+ check_error();
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1000);
+ check_error();
+ }
}
projects / movit / blobdiff