Check for NULL program string in r200_translate_vertex_program().
Fixes bug reported by Chris Rankin. Added some new comments.
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@ -389,6 +389,12 @@ static unsigned long op_operands(enum prog_opcode opcode)
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/* DP4 version seems to trigger some hw peculiarity - fglrx does this on r200 however */
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#define PREFER_DP4
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/**
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* Generate an R200 vertex program from Mesa's internal representation.
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*
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* \return GL_TRUE for success, GL_FALSE for failure.
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*/
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static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
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{
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struct gl_vertex_program *mesa_vp = &vp->mesa_program;
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@ -401,6 +407,9 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
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vp->native = GL_FALSE;
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if (!mesa_vp->Base.String)
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return GL_FALSE;
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if ((mesa_vp->Base.InputsRead &
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~(VERT_BIT_POS | VERT_BIT_NORMAL | VERT_BIT_COLOR0 | VERT_BIT_COLOR1 |
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VERT_BIT_FOG | VERT_BIT_TEX0 | VERT_BIT_TEX1 | VERT_BIT_TEX2 |
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@ -423,7 +432,8 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
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int u_temp_i = R200_VSF_MAX_TEMPS - 1;
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struct prog_src_register src[3];
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/* if (getenv("R300_VP_SAFETY")) {
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#if 0
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if (getenv("R300_VP_SAFETY")) {
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WARN_ONCE("R300_VP_SAFETY enabled.\n");
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vpi = malloc((mesa_vp->Base.NumInstructions + VSF_MAX_FRAGMENT_TEMPS) * sizeof(struct prog_instruction));
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@ -454,7 +464,9 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
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vpi = &mesa_vp->Base.Instructions[mesa_vp->Base.NumInstructions-1];
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assert(vpi->Opcode == OPCODE_END);
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}*/
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}
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#endif
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/* FIXME: is changing the prog safe to do here? */
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if (mesa_vp->IsPositionInvariant) {
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struct gl_program_parameter_list *paramList;
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@ -470,6 +482,7 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
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vpi = malloc((mesa_vp->Base.NumInstructions + 4) * sizeof(struct prog_instruction));
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memset(vpi, 0, 4 * sizeof(struct prog_instruction));
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/* emit four dot product instructions to do MVP transformation */
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for (i=0; i < 4; i++) {
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GLint idx;
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tokens[3] = tokens[4] = i;
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@ -524,10 +537,13 @@ static GLboolean r200_translate_vertex_program(struct r200_vertex_program *vp)
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#endif
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}
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/* now append original program after our new instructions */
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memcpy(&vpi[i], mesa_vp->Base.Instructions, mesa_vp->Base.NumInstructions * sizeof(struct prog_instruction));
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/* deallocate original program */
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free(mesa_vp->Base.Instructions);
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/* install new program */
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mesa_vp->Base.Instructions = vpi;
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mesa_vp->Base.NumInstructions += 4;
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