Implement mipmap generation in YCbCrInput, now that we advertise single-texture.
authorSteinar H. Gunderson <sgunderson@bigfoot.com>
Sun, 19 Feb 2017 15:34:15 +0000 (16:34 +0100)
committerSteinar H. Gunderson <sgunderson@bigfoot.com>
Sun, 19 Feb 2017 15:34:15 +0000 (16:34 +0100)
ycbcr_input.cpp
ycbcr_input.h
ycbcr_input_test.cpp

index f748f1c..b9cda5b 100644 (file)
@@ -24,6 +24,7 @@ YCbCrInput::YCbCrInput(const ImageFormat &image_format,
        : image_format(image_format),
          ycbcr_format(ycbcr_format),
          ycbcr_input_splitting(ycbcr_input_splitting),
+         needs_mipmaps(false),
          type(type),
          width(width),
          height(height),
@@ -53,6 +54,8 @@ YCbCrInput::YCbCrInput(const ImageFormat &image_format,
                register_uniform_sampler2d("tex_cb", &uniform_tex_cb);
                register_uniform_sampler2d("tex_cr", &uniform_tex_cr);
        }
+
+       register_int("needs_mipmaps", &needs_mipmaps);
 }
 
 YCbCrInput::~YCbCrInput()
@@ -104,7 +107,7 @@ void YCbCrInput::set_gl_state(GLuint glsl_program_num, const string& prefix, uns
                        texture_num[channel] = resource_pool->create_2d_texture(internal_format, widths[channel], heights[channel]);
                        glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
                        check_error();
-                       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+                       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
                        check_error();
                        glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbos[channel]);
                        check_error();
@@ -116,6 +119,10 @@ void YCbCrInput::set_gl_state(GLuint glsl_program_num, const string& prefix, uns
                        check_error();
                        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
                        check_error();
+                       if (needs_mipmaps) {
+                               glGenerateMipmap(GL_TEXTURE_2D);
+                               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);
@@ -201,8 +208,10 @@ void YCbCrInput::invalidate_pixel_data()
 bool YCbCrInput::set_int(const std::string& key, int value)
 {
        if (key == "needs_mipmaps") {
-               // We currently do not support this.
-               return (value == 0);
+               if (ycbcr_input_splitting != YCBCR_INPUT_INTERLEAVED && value != 0) {
+                       // We do not currently support this.
+                       return false;
+               }
        }
        return Effect::set_int(key, value);
 }
index 712035c..566f828 100644 (file)
@@ -176,6 +176,7 @@ private:
        YCbCrFormat ycbcr_format;
        GLuint num_channels;
        YCbCrInputSplitting ycbcr_input_splitting;
+       int needs_mipmaps;  // Only allowed if ycbcr_input_splitting == YCBCR_INPUT_INTERLEAVED.
        GLenum type;
        GLuint pbos[3], texture_num[3];
        GLint uniform_tex_y, uniform_tex_cb, uniform_tex_cr;
index 1d1e23e..33ec74c 100644 (file)
@@ -13,6 +13,8 @@
 #include "resource_pool.h"
 #include "ycbcr_input.h"
 
+using namespace std;
+
 namespace movit {
 
 TEST(YCbCrInputTest, Simple444) {
@@ -923,4 +925,135 @@ TEST(YCbCrInputTest, TenBitPlanar) {
        expect_equal(expected_data, out_data, 4 * width, height, 0.002, 0.0003);
 }
 
+// Effectively scales down its input linearly by 4x (and repeating it),
+// which is not attainable without mipmaps.
+class MipmapNeedingEffect : public Effect {
+public:
+       MipmapNeedingEffect() {}
+       virtual bool needs_mipmaps() const { return true; }
+
+       // To be allowed to mess with the sampler state.
+       virtual bool needs_texture_bounce() const { return true; }
+
+       virtual string effect_type_id() const { return "MipmapNeedingEffect"; }
+       string output_fragment_shader() { return read_file("mipmap_needing_effect.frag"); }
+       virtual void inform_added(EffectChain *chain) { this->chain = chain; }
+
+       void set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
+       {
+               Node *self = chain->find_node_for_effect(this);
+               glActiveTexture(chain->get_input_sampler(self, 0));
+               check_error();
+               glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+               check_error();
+               glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+               check_error();
+       }
+
+private:
+       EffectChain *chain;
+};
+
+// Basically the same test as EffectChainTest_MipmapGenerationWorks,
+// just with the data converted to Y'CbCr (as red only).
+TEST(EffectChainTest, MipmapGenerationWorks) {
+       unsigned width = 4;
+       unsigned height = 16;
+       float red_data[width * height] = {  // In 4x4 blocks.
+               1.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.5f, 0.0f, 0.0f,
+               0.0f, 0.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+       };
+       float expected_data[width * height] = {  // Repeated four times each way.
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+       };
+       float expected_data_rgba[width * height * 4];
+       unsigned char ycbcr_data[width * height * 3];
+
+       // Convert to Y'CbCr.
+       YCbCrFormat ycbcr_format;
+       ycbcr_format.luma_coefficients = YCBCR_REC_709;
+       ycbcr_format.full_range = false;
+       ycbcr_format.num_levels = 256;
+       ycbcr_format.chroma_subsampling_x = 1;
+       ycbcr_format.chroma_subsampling_y = 1;
+       ycbcr_format.cb_x_position = 0.5f;
+       ycbcr_format.cb_y_position = 0.5f;
+       ycbcr_format.cr_x_position = 0.5f;
+       ycbcr_format.cr_y_position = 0.5f;
+
+       float offset[3];
+       Eigen::Matrix3d ycbcr_to_rgb;
+       compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
+
+       Eigen::Matrix3d rgb_to_ycbcr = ycbcr_to_rgb.inverse();
+       for (unsigned i = 0; i < 64; ++i) {
+               Eigen::Vector3d rgb(red_data[i], 0.0, 0.0);
+               Eigen::Vector3d ycbcr = rgb_to_ycbcr * rgb;
+               ycbcr(0) += offset[0];
+               ycbcr(1) += offset[1];
+               ycbcr(2) += offset[2];
+               ycbcr_data[i * 3 + 0] = lrintf(ycbcr(0) * 255.0);
+               ycbcr_data[i * 3 + 1] = lrintf(ycbcr(1) * 255.0);
+               ycbcr_data[i * 3 + 2] = lrintf(ycbcr(2) * 255.0);
+       }
+
+       // Expand expected_data to RGBA.
+       for (unsigned i = 0; i < 64; ++i) {
+               expected_data_rgba[i * 4 + 0] = expected_data[i];
+               expected_data_rgba[i * 4 + 1] = 0.0f;
+               expected_data_rgba[i * 4 + 2] = 0.0f;
+               expected_data_rgba[i * 4 + 3] = 1.0f;
+       }
+
+       ImageFormat format;
+       format.color_space = COLORSPACE_sRGB;
+       format.gamma_curve = GAMMA_sRGB;
+
+       float out_data[width * height];
+       EffectChainTester tester(NULL, width, height);
+       YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height, YCBCR_INPUT_INTERLEAVED);
+       input->set_pixel_data(0, ycbcr_data);
+       tester.get_chain()->add_input(input);
+       tester.get_chain()->add_effect(new MipmapNeedingEffect());
+       tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       // The usual pretty loose limits.
+       expect_equal(expected_data_rgba, out_data, width * 4, height, 0.025, 0.002);
+}
+
 }  // namespace movit