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glutils: privatise matrix multiplication/videoaffinetransformation retrieval
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parent
4315a4b54d
commit
4de388278a
7 changed files with 66 additions and 9 deletions
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@ -1624,8 +1624,6 @@ gst_gl_get_plane_start
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gst_gl_value_get_texture_target_mask
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gst_gl_value_set_texture_target
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gst_gl_value_set_texture_target_from_mask
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gst_gl_get_affine_transformation_meta_as_ndc
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gst_gl_multiply_matrix4
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gst_gl_check_extension
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</SECTION>
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@ -105,3 +105,63 @@ gst_gl_context_gen_shader (GstGLContext * context, const gchar * vert_src,
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return *shader != NULL;
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}
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static const gfloat identity_matrix[] = {
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1.0f, 0.0f, 0.0, 0.0f,
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0.0f, 1.0f, 0.0, 0.0f,
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0.0f, 0.0f, 1.0, 0.0f,
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0.0f, 0.0f, 0.0, 1.0f,
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};
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static const gfloat from_ndc_matrix[] = {
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0.5f, 0.0f, 0.0, 0.5f,
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0.0f, 0.5f, 0.0, 0.5f,
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0.0f, 0.0f, 0.5, 0.5f,
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0.0f, 0.0f, 0.0, 1.0f,
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};
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static const gfloat to_ndc_matrix[] = {
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2.0f, 0.0f, 0.0, -1.0f,
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0.0f, 2.0f, 0.0, -1.0f,
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0.0f, 0.0f, 2.0, -1.0f,
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0.0f, 0.0f, 0.0, 1.0f,
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};
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void
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gst_gl_multiply_matrix4 (const gfloat * a, const gfloat * b, gfloat * result)
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{
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int i, j, k;
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gfloat tmp[16] = { 0.0f };
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if (!a || !b || !result)
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return;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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for (k = 0; k < 4; k++) {
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tmp[i + (j * 4)] += a[i + (k * 4)] * b[k + (j * 4)];
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}
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}
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}
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for (i = 0; i < 16; i++)
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result[i] = tmp[i];
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}
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void
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gst_gl_get_affine_transformation_meta_as_ndc (GstVideoAffineTransformationMeta *
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meta, gfloat * matrix)
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{
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if (!meta) {
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int i;
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for (i = 0; i < 16; i++) {
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matrix[i] = identity_matrix[i];
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}
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} else {
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gfloat tmp[16] = { 0.0f };
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gst_gl_multiply_matrix4 (from_ndc_matrix, meta->matrix, tmp);
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gst_gl_multiply_matrix4 (tmp, to_ndc_matrix, matrix);
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}
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}
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@ -28,6 +28,9 @@ G_BEGIN_DECLS
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gboolean gst_gl_context_gen_shader (GstGLContext * context,
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const gchar * shader_vertex_source,
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const gchar * shader_fragment_source, GstGLShader ** shader);
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void gst_gl_multiply_matrix4 (const gfloat * a, const gfloat * b, gfloat * result);
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void gst_gl_get_affine_transformation_meta_as_ndc (GstVideoAffineTransformationMeta *
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meta, gfloat * matrix);
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G_END_DECLS
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@ -722,7 +722,7 @@ static const gfloat to_ndc_matrix[] = {
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0.0f, 0.0f, 0.0, 1.0f,
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};
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void
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static void
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gst_gl_multiply_matrix4 (const gfloat * a, const gfloat * b, gfloat * result)
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{
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int i, j, k;
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@ -56,12 +56,6 @@ gboolean gst_gl_value_set_texture_target (GValue * value, GstGLTextureTarget tar
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GST_EXPORT
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GstGLTextureTarget gst_gl_value_get_texture_target_mask (const GValue * value);
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GST_EXPORT
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void gst_gl_multiply_matrix4 (const gfloat * a, const gfloat * b, gfloat * result);
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GST_EXPORT
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void gst_gl_get_affine_transformation_meta_as_ndc (GstVideoAffineTransformationMeta *
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meta, gfloat * matrix);
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G_END_DECLS
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#endif /* __GST_GL_UTILS_H__ */
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@ -26,6 +26,7 @@
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G_BEGIN_DECLS
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gboolean gst_gl_run_query (GstElement * element, GstQuery * query, GstPadDirection direction);
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void gst_gl_get_affine_transformation_meta_as_ndc (GstVideoAffineTransformationMeta * meta, gfloat * matrix);
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G_END_DECLS
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@ -34,6 +34,7 @@
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#include "gstglviewconvert.h"
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#include "gstglsl_private.h"
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#include "gstglutils_private.h"
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#include <gst/video/gstvideoaffinetransformationmeta.h>
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#define USING_OPENGL(context) (gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL, 1, 0))
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